Bezmiâlem Sultan
Bezmiâlem Sultan( 1807 – 2 May 1853), meaning" Ornament of the Universe" in Persian, was the ninth wife of Sultan Mahmud II, and Valide Sultan to their son, Sultan Abdulmejid I of the Ottoman Empire.
Saliha Sultan (wife of Mustafa II)
Saliha Sultan (1680 – 21 September 1739) was the consort of Sultan Mustafa II of the Ottoman Empire, and Valide sultan to their son, Sultan Mahmud I.
Sineperver Sultan
Sineperver Sultan( died 11 December 1828) alias Ayşe was the wife of Sultan Abdulhamid I and Valide Sultan to their son Sultan Mustafa IV of the Ottoman Empire.
Halime Sultan
Halime Sultan was a consort of Sultan Mehmed III, and the mother of Sultan Mustafa I and the Valide Sultan as well as a regent of the Ottoman empire.
She had four children with Mehmed: Şehzade Mahmud, Mustafa I, and two daughter.
She was de facto- co-ruler as Valide Sultan from 22 November 1617 to 26 February 1618 and from 19 May 1622 to 10 September 1623.
She is of the Ottoman Empire.
Halime was also one of the eminent figures during the era known as the Sultanate of Women.
Halime lived in the Ottoman empire as a courtier during the reign of five Sultans: Murad III, Mehmed III, Ahmed I, Mustafa I, and Osman II.
Nakşidil Sultan
Nakşidil Sultan( 1768 – 22 August 1817; meaning" Embroidered on the Heart" in Persian) was the consort of Ottoman Sultan Abdul Hamid I and Valide Sultan to her son Mahmud II.
Gülnuş Sultan
Gülnuş Sultan( 1642 – 6 November 1715) was Haseki Sultan of Ottoman Sultan Mehmed IV and Valide Sultan to their sons Mustafa II and Ahmed III.
Perestu Kadın
Perestu Kadın( from Persian پرستو" parastūswallow"; born Rahime Gogen; 1830 – 1904) was the eighth and legal wife of Sultan Abdulmejid I of the Ottoman Empire.
She was given the title and position of Valide sultan when Abdul Hamid II ascended the throne in 1876 making her the last Valide Sultan of the Ottoman Empire.
Mehmed III
Mehmed III ("Meḥmed-i sālis"; ; 26 May 1566– 21 December 1603) was Sultan of the Ottoman Empire from 1595 until his death in 1603.
Aşub Sultan
Aşub Sultan( died 4 December 1689) was a consort of Ottoman Sultan Ibrahim I and Valide Sultan to their son Suleiman II.
Handan Sultan
Handan Sultan (meaning "smiling" in Persian; died 9 November 1605) was the consort of Sultan Mehmed III, and Valide Sultan to their son Sultan Ahmed I.

Question: What nationality is Handan Sultan's husband?
Answer: Ottoman Empire