Romein, Jan (translated by R. T. Clark). The Asian Century: A History of Modern Nationalism in Asia (De eeuw van Azie). University of California Press, 1962. p. 170. "In 1930 geographical names were 'turkicized'. [...] Adrianople Edirne, and so on."
britannica.com
"It served as the capital of the Ottoman Empire from 1413 until 1458 and flourished as an administrative, commercial, and cultural centre." "Edirne"Encyclopædia Britannica. Retrieved 19 December 2014
"In 1363 the Ottoman capital moved from Bursa to Edirne, although Bursa retained its spiritual and economic importance." Ottoman Capital Bursa. Official website of Ministry of Culture and Tourism of the Republic of Turkey. Retrieved 19 December 2014. Contradicted by refs cited in Conquest of Adrianople