His Burial by his Son Constantius at Constantinople
Thus did they there testify their respect for the memory of him who had been honored by God. The second of his sons, however, who had by this time arrived, proceeded to celebrate his father's funeral in the city which bears his name, himself heading the procession, which was preceded by detachments of soldiers in military array, and followed by vast multitudes, the body itself being surrounded by companies of spearmen and heavy armed infantry. On the arrival of the procession at the church dedicated to the apostles of our Saviour, the coffin was there entombed. Such honor did the youthful emperor Constantius render to his deceased parent, both by his presence, and by the due performance of this sacred ceremony.
Source: Life of Constantine (New Advent)