The President of the Constitutional Court (Spanish: "Presidente del Tribunal Constitucional" ) of Spain is the head of the Constitutional Court, the highest body with the power to determine the constitutionality of acts of the Spanish Government and regional governments.
 It is defined in (i.e. sections 159 through 165) of the Constitution of Spain, and further governed by Organic Laws 2/1979 (a.k.a. Law of the Constitutional Court of October 3, 1979), 8/1984, 4/1985, 6/1988, 7/1999 and 1/2000.
 The court is the "supreme interpreter" of the Constitution, but since the court is not a part of the Spanish Judiciary, the Supreme Court is the highest court for all judicial matters.
The judiciary of Somalia is defined by the Provisional Constitution of the Federal Republic of Somalia.
 It stipulates that the national court structure is to be organized into three tiers: the Constitutional Court, Federal Government level courts, and Federal Member State level courts.
 A future nine-member Judicial Service Commission is empowered to appoint any federal tier member of the judiciary.
 It also selects and presents potential Constitutional Court judges to the House of the People of the Federal Parliament for approval.
 If endorsed, the President then appoints the candidate as a judge of the Constitutional Court.
 The five-member Constitutional Court is likewise empowered to adjudicate issues pertaining to the constitution, in addition to various federal and sub-national matters.
Ivan Petrovich Dombrovskyy (Ukrainian: Іван Петрович Домбровський ; born March 7, 1947 in Tsekhanivka, Odessa Oblast) is Judge of the Constitutional Court of Ukraine since August 4, 2006 and its chairman since September 19, 2006.
 He was elected under the Congress of Judges' quota and is the oldest among the current judges of Constitutional Court.
 He resigned from the position of chairman of the Constitutional Court on May 17, 2007, and was replaced by Valeriy Pshenychnyy.
Sergio Mattarella, {'1': ", '2': ", '3': 'OMRI, OMCA', '4': "} (] ; born 23 July 1941) is an Italian politician, lawyer and judge who is the 12th and current President of Italy since 2015.
 He was a member of Parliament from 1983 to 2008, serving as Minister of Education from 1989 to 1990 and as Minister of Defence from 1999 to 2001.
 In 2011, he became an elected judge on the Constitutional Court.
 On 31 January 2015, he was elected by parliament to be the 12th President of the Italian Republic.
 He is the first Sicilian to have held the post.
The Constitutional Court of Burundi (French: "Cour constitutionnelle" ) is the supreme authority on Burundi's constitutional law.
 The Constitutional Court deals with the interpretation of the Constitution of 2005 and is considered the country's second highest court.
 In conjunction with the Burundian Supreme Court ("Cour Suprême"), the Constitutional Court can sit "en banc" as a High Court of Justice ("Haute Cour de Justice") with special prerogatives, such as the power to try an incumbent president.
The Constitutional Court of South Africa is a supreme constitutional court established by the Constitution of South Africa.
 It was originally the final appellate court for constitutional matters.
 Since the enactment of the Superior Courts Act in 2013, the Constitutional Court has jurisdiction to hear any matter if it is in the interests of justice for it to do so.
Ahmad Fadlil Sumadi is a former judge on the Constitutional Court of Indonesia.
 Sumadi initially served as the registrar of the Constitutional Court between 2003 and 2008, then served as the deputy chief justice of the High Court of Yogyakarta before the Supreme Court of Indonesia appointed him to the Constitutional Court in 2010.
Mohammad Laica Marzuki is a former judge of the Constitutional Court of Indonesia, as well as the first Deputy Chief Justice of the Constitutional Court of Indonesia.
 During his tenure, Marzuki was one of three of the Constitutional Court's nine members to dissent from the majority opinion that rejected the appeal of Bali Nine members Myuran Sukumaran and Andrew Chan.
 This follows Marzuki's view that the death penalty in general does not deter criminals and violates the Constitution of Indonesia.
 Marzuki has also expressed the view that the actions of the Attorney General of Indonesia must be subordinate to the decisions of the Constitutional Court, and that actions which conflict with such decisions are illegal under the law of Indonesia.
The Constitutional Court of Sint Maarten (Dutch: "Constitutioneel hof van Sint Maarten" ) is a court of Sint Maarten.
 As a constitutional court it evaluates the constitutionality of the provisions of legislation which is approved by the Estates of Sint Maarten and signed into law, but which has not entered into force.
 Procedures by the court may be initiated only by the ombudsman of Sint Maarten.
 As of July 2016, the court has decided two cases.
 Sint Maarten is the only country in the Kingdom of the Netherlands with a constitutional court.
Bernardo Mattarella (15 September 1905 – 1 March 1971) was an Italian politician for the Christian Democrat party ("Democrazia Cristiana", DC).
 He has been Minister of Italy several times.
 He was the father of Piersanti Mattarella and Sergio Mattarella, who both became politicians as well; Sergio is the President of the Italian Republic since 3 February 2015 and Piersanti was President of the Regional Government of Sicily, before being assassinated in 1980 by "Cosa Nostra".

Question: Which son of Bernardo Mattarella was an elected judge on the Constitutional Court?
Answer: Sergio Mattarella