Question: Whatis the name of this Ottoman sultan who ruled from August 1444-September 1446 that brought an end to the Eastern Roman Empire and was the son of Murad II
Context: This is a list of campaigns personally led by Mehmed II or Sultan Mehmed the Conqueror (30 March 1432 – 3 May 1481) (Ottoman Turkish: محمد ثانى, Meḥmed-i s̠ānī; Turkish: II.  Mehmet; also known as el-Fātiḥ, الفاتح, "the Conqueror" in Ottoman Turkish; in modern Turkish, Fatih Sultan Mehmet; also called Mahomet II in early modern Europe) was Sultan of the Ottoman Empire twice, first for a short time from 1444 to September 1446, and later from February 1451 to 1481.  At the age of 21, he conquered Constantinople and brought an end to the Byzantine Empire, transforming the Ottoman state into an empire.  Mehmed continued his conquests in Asia, with the Anatolian reunification, and in Europe, as far as Bosnia and Croatia.  Mehmed II is regarded as a national hero in Turkey, and Istanbul's Fatih Sultan Mehmet Bridge is named after him. Şehzade Murad (c. 1495, Amasya – 1519, Kashan or Isfahan) was an Ottoman prince ("şehzade"), the son of Şehzade Ahmet.  He was involved in the chaotic upheaval surrounding the succession to Sultan Bayezid II (r. 1481-1512).  Murad's father, the legal heir to the Ottoman throne, fought against Selim I and received support from king Ismail I (1501-1524) of the neighboring Safavid Empire.  When Ahmet however was put to death by Selim following his unsuccessful attempt, prince Murad was subsequently given support by Ismail I as claimant to the throne.  Ismail I wanted to use prince Murad in order to mobilize opposition against Selim I.  In 1512, during Nur-Ali Khalifa's large-scale campaign in Anatolia, Murad joined his campaign, and even "girded the Qizilbash crown".  According to information Selim I received from his spies (December 1512/January 1513), Ismail I allegedly wanted to conquer Anatolia, give the Rum beylerbeylik to Murad, while the rest of the territory would be ruled by the Qizilbash.  Anyhow, when the Safavid support meant for Murad failed to materialize, the scheme was abandonded, and Murad migrated to the Safavid Empire where he was given asylum.  He died at Kashan, or Isfahan. The Siege of Svetigrad began on May 14, 1448 when an Ottoman army, led by Sultan Murad II, besieged the fortress of Svetigrad (now Kodžadžik).  After the many failed Ottoman expeditions into Albania against the League of Lezhë, a confederation of Albanian Principalities created in 1444 and headed by Skanderbeg, Murad II decided to march an army into Skanderbeg's dominions in order to capture the key Albanian fortress of Svetigrad.  The fortress lay on an important route between Macedonia and Albania, and thus its occupation would give the Ottomans easy access into Albania.  The force prepared by Murad was the largest force with which the Ottomans had ever attacked Skanderbeg.  Murad planned to take the fortress, march into the Albanian interior, and capture the main citadel of Krujë, thus crushing the Albanian League. The Treaty of Edirne and the Peace of Szeged were two halves of a peace treaty between Sultan Murad II of the Ottoman Empire and King Vladislaus of the Kingdom of Hungary.  Despot Đurađ Branković of the Serbian Despotate also had a large role in the proceedings.  The ratification took place on August 15, 1444 in Várad, a few months before the end of the Crusade of Varna. At the Battle of Niš ("Battle of Nish") (early November, 1443), crusaders led by John Hunyadi, captured the Ottoman stronghold of Nish (now Niš, Serbia) and defeated three armies of the Ottoman Empire.  The Battle of Niš was part of Hunyadi's expedition known as the "long campaign".  Hunyadi, at the head of the vanguard, crossed the Balkans through the Gate of Trajan, captured Niš, defeated three Turkish pashas, and after taking Sofia, united with the royal army and defeated Sultan Murad II at Snaim (Kustinitza).  The impatience of the king and the severity of the winter then compelled him (in February 1444) to return home, but not before he had utterly broken the Sultan's power in Bosnia, Herzegovina, Serbia, Bulgaria, and Albania. Hatice Âlime (Halime) Hüma Hatun (Ottoman Turkish: هما خاتون‎ , 1410 ‒ September 1449) was the fourth wife of Ottoman Sultan Murad II and mother of Mehmed II.  She was a slave girl.  Nothing is known of her family background, apart from the fact that an Ottoman inscription (vakfiye) describes her as "Hātun binti Abdullah" (Daughter of Abdullah); at that time, people who converted to Islam were given the name "Abdullah" meaning "Servant of God", which is evidence of her non-Muslim origin.  Her name, "hüma", means "bird of paradise", after the Persian legend.  There are two theories on her origin: She was a romanian named Stella; She was Serbian, some sources saying that she was a princess from the Principality of Zeta and a relative of Đurađ II Balšić.  S. Runciman and Ilber Ortayli support that she was of Slavic descent.  She died in September 1449 in Bursa. The following is a list of Sheikh-ul-Islams of the Ottoman Empire.  After the fondation of the Ottoman empire around 1300, the title of Sheikh-ul-Islam, formerly used in the Abbasid Caliphate, was given to a leader authorized to issue legal opinion or fatwa.  During the reign of Sultan Murad II, (1421-1444, 1446-1451) the position became an official title, with authority over other muftis in the empire.  In the late 16th century, Sheikh-ul-Islam were assigned to appoint and dismiss supreme judges, high ranking college professors, and heads of Sufi orders.  Prominent figures include Zenbilli Ali Cemali Efendi (c1445-1526), Ibn-i Kemal (Kemalpasazade) (1468-1533) and Ebussuud Efendi (c1491-1574). The Byzantine Empire, also referred to as the Eastern Roman Empire, was the continuation of the Roman Empire in the East during Late Antiquity and the Middle Ages, when its capital city was Constantinople (modern-day Istanbul, which had been founded as Byzantium).  It survived the fragmentation and fall of the Western Roman Empire in the 5th century AD and continued to exist for an additional thousand years until it fell to the Ottoman Turks in 1453.  During most of its existence, the empire was the most powerful economic, cultural, and military force in Europe.  Both "Byzantine Empire" and "Eastern Roman Empire" are historiographical terms created after the end of the realm; its citizens continued to refer to their empire as the "Roman Empire" (Greek: Βασιλεία τῶν Ῥωμαίων , tr.  "Basileia tôn Rhōmaiōn" ; Latin: "Imperium Romanum" ), or "Romania" (Ῥωμανία ), and to themselves as "Romans". Mehmed II (Ottoman Turkish: محمد ثانى‎ , "Meḥmed-i sānī"; Modern Turkish: "II.  Mehmet" ; 30 March 1432 – 3 May 1481), commonly known as Mehmed the Conqueror (Turkish: "Fatih Sultan Mehmet" ), was an Ottoman sultan who ruled first for a short time from August 1444 to September 1446, and later from February 1451 to May 1481.  At the age of 21, he conquered Constantinople (modern-day Istanbul) and brought an end to the Eastern Roman Empire.  Mehmed continued his conquests in Anatolia with its reunification and in Southeast Europe as far west as Bosnia.  Mehmed is considered a hero in modern-day Turkey and parts of the wider Muslim world.  Among other things, Istanbul's Fatih district, Fatih Sultan Mehmet Bridge and Fatih Mosque are named after him. Murad II's reign was marked by the long war he fought against the Christian feudal lords of the Balkans and the Turkish beyliks in Anatolia, a conflict that lasted 25 years.  He was brought up in Amasya, and ascended the throne on the death of his father Mehmed I.  His mother was Valide Sultan Emine Hatun (daughter of Suleyman Bey, ruler of Dulkadirids), his father's third consort.  Their marriage served as an alliance between the Ottomans and this buffer state, and produced a son, Mehmed II, who would go on to successfully conquer the Byzantine Empire's capital, Constantinople, in 1453.
Answer: Mehmed the Conqueror