 Although there are brief mentions of the building in a variety of sources, the accounts of Procopius, Constantine of Rhodes, and Nicholas Mesarites are the only known substantial textual descriptions of the building's appearance.Churches such as the Basilica of St. John, St Mark's Basilica, Cathédrale Saint-Front, and the Basilica of Saint Anthony of Padua are believed to have been modeled on Justinian's Holy Apostles, but they differ from each other significantly.The church's mausoleums were the resting place for most Eastern Roman emperors and members of their families for seven centuries, beginning with Constantine I (d. 337) and ending with Constantine VIII (d. 1028).