Ulubatlı Hasan — Turkish Wikipedia

Turkish Wikipedia article on Ulubatli Hasan; it discusses his once-debated reality and reports Hakan Yilmaz's research conclusions: a son of Abdullah born about 1390, the sultan's experienced official standard-bearer and sekbanbashi, holder of a waqf deed of 828/1425 drawn up by Molla Fenari styling him 'planter of the banner of Islam', and depicted in a contemporary miniature of 1460 as an elderly bearded man climbing the Romanos tower.