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Kadi Ahmad Burhan al-Din (Azerbaijani: Qazi Bürhanəddin, Turkish: Kadı Burhaneddin; died 1398) was an Oghuz. vizier and atabeg to the Eretnid rulers of Anatolia. In 783 AH (1381–1382) he took over Eretnid lands and claimed the title of sultan for himself. He is most often referred to by the title kadi, or Islamic judge, his first position under the Eretnids.
He was born on 8 January 1345 in Kayseri. His father, Muhammad Shams al-Din, like his grandfather and great-grandfather, was a kadi, descended from the Oghuz Turkish tribe of Salur. His father gave him his first education, which he furthered in Egypt, Damascus, and Aleppo. When he returned to his hometown in 1364/65, one year after his father's death, the local ruler, the Eretnid Giyath al-Din Muhammad, so esteemed his education and character that he gave the young man not only the post of kadi, but also the hand of his daughter.
Despite this unusual favour, Burhan al-Din secretly participated in the rebellion of the local magnates (beys) in which Giyath al-Din was killed in 1365. The latter's successors were incompetent, and Burhan al-Din rose further to the posts of vezir and atabeg, before proclaiming himself as the sovereign sultan of the Eretnid domains in 1381/82.
The Eretnid sultanate he inherited had a large Turkmen and Mongol population but also contained many of the older, established urban centers of the Seljuks of Rum and Ilkhanid Anatolia. The sultanate resembled these older states more than the Turkmen beyliks then ascendant in other parts of Anatolia.
The Kadi’s eighteen-year rule was not peaceful. He challenged the Turkmen Karamanids and Beylik of Erzincan and twice fought Kötürüm Bayezid, Jandarid bey of Kastamonu. In 1387, he was defeated by the Mamluks of Egypt. The Ottoman Sultan Bayezid I, accompanied by his vassal the Byzantine Emperor Manuel II Palaeologos, campaigned against Burhan al-Din in 1391, but was defeated at the Battle of Kırkdilim. He met his end in 1398 at the hands of the Ak Koyunlu and was succeeded by his son Zayn al-‘Abidin, who ruled for a short time between 1398 and 1399. His türbe, or mausoleum, survives in Sivas.
'Aziz ibn Ardashir Astarbadi, a companion of Kadi Burhan al-Din, wrote a Persian language history of his rule called Bazm-u Razm which was edited by M. F. Köprülüzade in 1928. An analysis and commentary has been provided by H. H. Giesecke, Das Werk des ‘Azīz ibn Ardašīr Astarābādi (Leipzig, 1940).