Let us look briefly at what information about the burial place of Saint Despot Stefan is preserved in the written testimonies, beginning our review of the relevant documents with the oldest sources and proceeding to the younger ones: first we shall look at the oldest testimonies, from the 15th century, written by contemporaries of the Holy Despot. Let the sources speak for themselves - we shall present them in the original text and in translation, where possible with a note on the existing editions of the text and translation.
Sources from the 15th century
The year 1431: Constantine the Philosopher (of Kostenets) [Life of Despot Stefan Lazarević]: „Обрѣть же прикладьнѣишеѥ и добрѣишеѥ, идѣже убо бѣше домь быти, иже и молитвовавьше дѣла касааше се и основаниѥ вьдрѹжаѥть се вь име светыѥ троице вьседерьжавьнааго божьства. ... Сьтвори же себѣ гробницѹ тѹ, идѣже маломь послѣжде положи се.“ = [Vatroslav Jagić], "Constantine the Philosopher and His Life of Stefan Lazarević, Despot of Serbia: From Two Serbian-Slavonic Manuscripts, Newly Edited by V. Jagić" („Константин Филозоф и његов Живот Стефана Лазаревића деспота српскога: по двјема српско-словенским рукописима, изновице издао В. Јагић“), Herald of the Serbian Learned Society (Гласник Српског ученог друштва), Book XLII (1875): 223–377: 288–289.
"Having found the most fitting and the best (place), where the church was to be, he prayed and set about the work; and he laid the foundation in the name of the Holy Trinity, the all-sustaining Godhead. ... There he made himself a tomb, where he was laid not long after." Constantine the Philosopher, Life of Despot Stefan, 52 (translation by Lazar Mirković and Gordana Jovanović) = Constantine the Philosopher, Tale of the Letters (Skazanije o pismenekh) - Life of Despot Stefan Lazarević (Повест о словима (Сказаније о писменех) - Житије деспота Стефана Лазаревића), Old Serbian Literature in 24 Books (Стара српска књижевност у 24 књиге), Book 11; translated by Gordana Jovanović and Lazar Mirković; ed. Gordana Jovanović (Belgrade: Prosveta - Srpska književna zadruga, 1989), 103.