8.  The applicant was born in 1950 and lives in Komotini. 9.  The applicant’s husband, Moustafa Molla Sali, a member of the Muslim community of Thrace, died on 21 March 2008. On 7 February 2003 he had drawn up a notarised public will in accordance with the relevant provisions of the Civil Code. He had bequeathed his whole estate to his wife, namely: one-third of a 2,000 sq. m plot of farmland near Komotini; one-half of a 127 sq. m apartment, a parking space and a basement in a block of flats in Komotini; one-quarter of a shop in Komotini with a surface area of 24 sq. m, and another shop measuring 31 sq. m in Komotini, which was subsequently expropriated in return for compensation that has already been paid to the applicant; and four properties in Istanbul. 10.  By decision no. 12.785/2003 of 10 June 2008 the Komotini Court of First Instance, on the basis of a next-of-kin certificate submitted by the applicant, approved the will presented before it. On 6 April 2010 the applicant accepted her husband’s estate by notarised deed. The Treasury was notified and the applicant registered the property transferred to her with the Komotini Land Registry, paying the corresponding registration fees. It does not appear from the case file that the applicant had to pay any inheritance tax on the property transferred to her. 11.  On 12 December 2009, meanwhile, the deceased’s two sisters had challenged the validity of the will before the Rodopi Court of First Instance. They asserted a claim to three-quarters of the property bequeathed. They submitted that they and the deceased belonged to the Thrace Muslim community and that therefore any questions relating to his estate were subject to Islamic religious law (Sharia law) and the jurisdiction of the mufti, rather than to the provisions of the Civil Code. They contended that the application of Muslim customs and Sharia law to Greek nationals of Muslim faith was laid down in the provisions of Article 14 § 1 of the 1920 Treaty of Sèvres (ratified by decree of 29 September/ 30 October 1923) and Articles 42 and 45 of the Treaty of Lausanne (ratified by decree of 25 August 1923) (see paragraphs 65-68 below). They argued that the law of succession applicable to Muslims was based on intestacy rather than testacy. Under Islamic law, where the deceased was survived by close relatives, the will only served to complement the intestate succession. Those provisions had continued to apply after the adoption of the Greek Civil Code, pursuant to section 6 of the Introductory Law to the Code, solely in respect of Greek nationals of Muslim faith living in Thrace. 12.  By judgment no. 50/2010 of 1 June 2010, the Rodopi Court of First Instance dismissed the challenge brought by the deceased’s sisters. It held that applying the Islamic law of succession to Greek Muslims in such a way as to prevent them from disposing of their property in anticipation of their death gave rise to unacceptable discrimination on grounds of religious beliefs. It found that the consequent inability of such persons to draw up a public will was in breach of Article 4 (principle of equality), Article 5 § 1 (free development of personality), Article 5 § 2 (principle of non-discrimination) and Article 13 § 1 (freedom of religious conscience) of the Constitution, as well as Article 14 of the Convention and Article 1 of Protocol No. 1. The court emphasised that even if it should be inferred from section 5(2) of Law no. 1920/1991 (ratifying the Legislative Act of 24 December 1990 on Muslim ministers of religion) that inheritance matters for Muslims were governed by Sharia law, such law should be applied in a manner compatible with the Constitution and the Convention. The incompatibility in the present case had stemmed from interpreting the Islamic law of succession in such a way as to deprive the persons concerned of some of their civil rights, against their wishes. The court added that although the application of Sharia law was based, inter alia, on international law, and in particular on the combined effect of Articles 42 and 45 of the Treaty of Lausanne, it should not result in the Islamic law of succession being applied in such a way as to curtail the civil rights of Greek Muslims, because the aim of the treaty had not been to deprive the members of that minority of such rights, but to strengthen their protection. 13.  The court pointed out that a Greek Muslim contacting a notary in order to draw up a public will was exercising his right to dispose of his property, in anticipation of his death, under the same conditions as other Greek citizens. It was consequently impossible to annul the will or to override any of its legal effects on the grounds that a will of that kind was prohibited by Sharia law. Upholding the claimants’ arguments would thus amount to introducing an unacceptable difference in treatment among Greek nationals on the grounds of their religious beliefs. 14.  On 16 June 2010 the deceased’s sisters appealed against the aforementioned judgment. 15.  On 28 September 2011 the Thrace Court of Appeal dismissed the appeal (judgment no. 392/2011). It emphasised, firstly, that the legislative provisions enacted pursuant to the Treaties of Sèvres and Lausanne had been intended to protect Greek nationals of Muslim faith and were in conformity with the Constitution and the Convention. That applied both to Islamic wills and to intestate succession, and the mufti had no jurisdiction in relation to public wills. The court held that since the testator was free to choose the type of will he wished to draw up in the exercise of his rights and therefore to draw up a public will in accordance with Article 1724 of the Civil Code, he was not obliged to follow Islamic law, which did not cover matters relating to such wills. Furthermore, the mufti had no jurisdiction over the testator’s wishes, which could not be circumscribed. Otherwise, there would be discrimination on grounds of religion, which was unlawful under the general rules on prohibition of discrimination. 16.  More specifically, the Court of Appeal noted that the decision taken by the deceased, a Greek citizen of Muslim faith belonging to the Thrace Muslim religious minority, to ask a notary to draw up a public will, choosing personally to decide how and to whom he would bequeath his property, fell within his legal right to dispose of his property in anticipation of his death, under the same conditions as other Greek nationals. 17.  On 23 January 2012 the deceased’s sisters lodged an appeal on points of law. 18.  By judgment no. 1862/2013 of 7 October 2013 and on the basis of a provision of international law, namely Article 11 of the 1913 Treaty of Athens, and provisions of domestic law, namely section 4 of Law no. 147/1914, section 10 of Law no. 2345/1920 (enacted pursuant to the 1913 Treaty of Athens) and section 5(2) of Law no. 1920/1991 the Court of Cassation allowed the appeal. It noted that section 10 of Law no. 2345/1920 (on the provisional Arch-Mufti and muftis serving Muslims residing in the territory) reproduced the contents of Article 11 § 8.1 of the Treaty of Athens, pursuant to which muftis exercised their jurisdiction over Muslims in the spheres of marriage, divorce, maintenance payments, guardianship, trusteeship, capacity of minors, Islamic wills and intestate succession. It emphasised that the law governing interpersonal relations among Greek nationals of Muslim faith, as laid down in the above-mentioned treaty ratified by Greece, was, pursuant to Article 28 § 1 of the Constitution, an integral part of Greek domestic law and prevailed over any other legal provision to the contrary. Examining the reasoning of the Court of Appeal’s judgment, it concluded that that court’s determination of the case had breached the relevant legislative provisions, because the law applicable to the deceased person’s estate had been the Islamic law of succession, which formed part of domestic law and applied specifically to Greek nationals of Muslim faith. It noted that the estate in question belonged to the category of property held “in full ownership” (mulkia) – public land which had belonged to the Ottoman administration, the full ownership of which had been transferred to private individuals and which had been governed by Sharia law during the Ottoman occupation – and that, consequently, the impugned public will had to be deemed invalid and devoid of legal effect on the grounds that Sharia law recognised no such institution. 19.  The Court of Cassation remitted the case to the Thrace Court of Appeal. 20.  By judgment no. 183/2015 of 15 December 2015 the Court of Appeal set aside the judgment delivered by the Rodopi Court of First Instance on 1 June 2010. In line with the Court of Cassation’s judgment, it held that the relevant legislative provisions had been intended to protect Greek nationals of Muslim faith, constituted a special body of law and did not breach the principle of equality secured under Article 4 of the Constitution or the right of access to a court as guaranteed by Article 6 of the Convention. It pointed out that the law applicable to the deceased’s estate had been Sharia law, because the property bequeathed belonged to the “mulkia” category, and that consequently the public will at issue was devoid of legal effect because Sharia law did not recognise any such institution. It emphasised that the judgments of the Court of Cassation were binding on the courts to which cases were remitted as regards the legal issues determined by those judgments. It therefore considered itself bound by the Court of Cassation’s judgment of 7 October 2013 and could not overrule it, thus being unable to allow a request by the applicant to seek a preliminary ruling from the Court of Justice of the European Union concerning the interpretation of section 5(2) of Law no. 1920/1991 and of Article 45 of the Treaty of Lausanne. Since an appeal on points of law was lodged against that judgment, it was not immediately enforceable. 21.  On 8 February 2016 the applicant appealed on points of law against the judgment of the Court of Appeal, and the hearing in the Court of Cassation was scheduled for 11 January 2017. She put forward a number of grounds of appeal. 22.  In her first ground of appeal she submitted that the impugned judgment had been insufficiently reasoned as regards one specific point which she considered to have had a decisive influence on the outcome of the proceedings, namely that it had ignored the question whether her husband had been a “practising Muslim”, which was a precondition for the application of the special body of law. 23.  The applicant’s second ground of appeal was that section 5(2) of Law no. 1920/1991 and certain Articles of the Civil Code had been incorrectly interpreted and applied. She submitted that the impugned judgment had extended the scope of the provisions creating a separate body of law for Greek nationals of Muslim faith to members of the Muslim community who did not faithfully adhere to Islamic doctrine. 24.  The applicant argued in conclusion that those grounds of appeal had not been encompassed in the legal issue determined by judgment no. 1862/2013 of the Court of Cassation. She pointed out that that judgment had concerned Greek nationals of Muslim faith in general and had not addressed the matter of the law applicable to non-practising members of the Muslim community. 25.  In her additional observations, the applicant contended that the case, which concerned the drawing up of a public will, a possibility afforded to all Greek citizens regardless of religious considerations, fell outside the mufti’s jurisdiction. The specific provisions concerning the Muslim minority could not, in her submission, be applied without violating the individual rights of Muslims as guaranteed under the Greek Constitution, as well as by Article 6 § 1 of the Convention and Article 1 of Protocol No. 1. 26.  By judgment no. 556/2017 of 6 April 2017 the Court of Cassation dismissed the appeal on points of law. It did not refer to the Convention in its reasoning. 27.  As regards the applicant’s first ground of appeal, it declared it inadmissible, finding that it was based on the extent of the deceased’s religious sentiment as a Muslim, a criterion that had no legal effect. It added that the deceased’s Greek nationality did not preclude the application of Sharia law. 28.  As regards the second ground of appeal, the Court of Cassation held that the Court of Appeal’s judgment had contained sound reasons, in line with the Court of Cassation’s judgment no. 1862/2013. It emphasised that the Court of Appeal had assessed the facts of the case in the light of substantive law and had given sufficient reasons for its determination of the fundamental issue of recognising the invalidity of the will. 29.  That judgment marked the end of the proceedings in respect of the property located in Greece. 30.  As a result of the whole proceedings, the applicant was deprived of three-quarters of the property bequeathed. 31.  In 2011, meanwhile, the testator’s sisters had applied to the Istanbul Civil Court of First Instance for the annulment of the will, in accordance with the principles of private international law enshrined in the Turkish Civil Code. They submitted that the will was contrary to Turkish public policy. Hearings were held on 9 February and 26 May 2016, but the court adjourned its consideration of the case on the grounds that the applicant still had to appeal on points of law against judgment no. 183/2015 of the Thrace Court of Appeal. The new hearing in the case was scheduled for 28 September 2017, and then adjourned until 18 January 2018. By the date of the present judgment the Court had yet to be informed of the progress of those proceedings.