What is "sukrullah"

Şükrullah (1388–1488) was a 15th-century Ottoman historian and diplomat. He was born in 1388 in Amasya and died in Constantinople and is one of the earliest Ottoman historians. He wrote a famous universal history in the 1460s Persian language named Bahjat al—tawari'kh [Joy of Histories] and presented it to Mahmud Pasha Angelovic. His work was used by later Ottoman historians.