Constantine VII "Porphyrogennetos" or "Porphyrogenitus", "the Purple-born" (), (September 2, 905 – November 9, 959) was the son of the Byzantine emperor Leo VI and his fourth wife Zoe Karbonopsina. He was also the nephew of the Emperor Alexander. He wrote two descriptive books, "De Administrando Imperio" and "De Ceremoniis".