Question: Amir Sultan was captured by which Turco-Mongol conqueror?

 As the founder of the Timurid Empire in Persia and Central Asia he became the first ruler in the Timurid dynasty. Timur (Persian: تیمور‎ ‎ "Temūr", Chagatai: "Temür "; 9 April 1336 – 18 February 1405), historically known as Amir Timur and Tamerlane (Persian: تيمور لنگ‎ ‎ "Temūr(-i) Lang", "Timur the Lame"), was a Turco-Mongol conqueror.  According to John Joseph Saunders, Timur's background was Iranized and not steppe nomadic. <SEP> Amir Sultan (1368–1429) was Amir Kulal Shamsuddin’s grandson.  He was invited by the Ottoman Sultan Bayezid I to Anatolia.  Bayezid I had a daughter from his marriage with Daulat Khatun (Devlet Hatun) who was married to Amir Sultan.  Daulat Khatun (Devlet Hatun) was a descendant of Jalal ud-Din Rumi.  By the end of fourteenth century Timur and Bayezid I had emerged as two superpowers in Asia and Europe, making the confrontation between two a matter of time.  Timur took the lead and conquered the Ottoman city of Sivas, disseminating the local population in his trademark style.  At the same time two princes, Ahmad Jalair (Ahmad (Jalayirids)) and Kara Yosuf (Qara Yusuf) sought for protection at Bayezid I's court.  Their territories had been conquered by Timur.  Timur sent two embassies demanding surrender of the two princes, but Bayezid I refused.  Bayezid I went a step further and prepared for an attack on Timur’s territory.  At this point his son-in-law Amir Sultan advised him against the move knowing well the penchant and proficiency of Timur and his soldiers in a battlefield.  However, his genteel council fell on deaf ears.  Instigated and incited by the two princes Bayezid I seized Erzurum which was under Timur’s rule.  The Mongol attack was ruthless and merciless and in one word, Timur “annihilated” the Ottoman army, taking Bayezid I, his children and princes as captives.  To Timur this was declaration of war and in his symbolic manner he started conquering Ottoman cities one by one with whirlwind speed.  Bayezid I took his army to stop Timur and the two goliaths met at the plains of Angora on 20 July 1401 (804AH).  Although Bayezid I had made a fierce reputation in Europe as a brilliant general and ferocious warrior but he was no match for Timur whose years in battlefield far exceeded Bayazid’s age. <SEP> The amir al-ʿarab (Arabic: أمير العرب, also known as amir al-ʿurban; translation: "commander of the Bedouins") was a title denoting the commander or leader of the Bedouin tribes in Syria in successive Muslim states during the Middle Ages.  The title was used as early as the 11th century to refer to Salih ibn Mirdas, but was formally turned into a state institution by the Ayyubid Sultanate and strengthened by the latter's Mamluk successors.  The office was preserved under the early Ottomans (16th–17th centuries), at least ceremonially, but its importance had faded by then.  The jurisdiction of the "amir al-ʿarab" was generally limited to central and northern Syria, and he often held "iqtaʿat" (fiefs) in the Syrian steppe, which formed the "imarat al-ʿarab" (emirate of the Bedouins).  The "imarat al-ʿarab" was created both to co-opt the often rebellious Bedouin tribes of Syria and to enlist their support as auxiliary troops.  Under the Mamluks, some of the principal duties of the "amir al-ʿarab" were guarding the desert frontier against the Mongol Ilkhanate in Iraq and Anatolia, ensuring Bedouin loyalty to the state, gathering intelligence on enemy forces, protecting infrastructure, villages and travelers from raids and providing horses and camels to the sultan.  In return, the "amir al-ʿarab" was given "iqtaʿat", an annual salary, official titles and honorary robes. <SEP> Sultan Amir Ahmad Bathhouse (Persian: حمام سلطان امیر احمد‎ ‎ , Hammam-e Sultan Amir Ahmad), also known as the Qasemi Bathhouse, is a traditional Iranian public bathhouse in Kashan, Iran.  It was constructed in the 16th century, during the Safavid era; however, the bathhouse was damaged in 1778 as a result of an earthquake and was renovated during the Qajar era.  The bathhouse is named after Imamzadeh Sultan Amir Ahmad, whose mausoleum is nearby.