Church of the Apostles
On 11 December 361, Julian entered Constantinople as sole emperor and, despite his rejection of Christianity, his first political act was to preside over Constantius' Christian burial, escorting the body to the Church of the Apostles, where it was placed alongside that of Constantine. This act was a demonstration of his lawful right to the throne. He is also now thought to have been responsible for the building of Santa Costanza on a Christian site just outside Rome as a mausoleum for his wife Helena and sister-in-law Constantina.