 Complete the following phrase:  Cantacuzinos involvement with the Wallachian administration began during the late stages of the Phanariote era, when both Principalities were being Hellenized. He first became a titled boyar in 1813, under Prince John Caradja, when he was appointed Serdar of the Wallachian military forces; in 1820, he was an Aga, or head of Wallachias police. In 1821, following the Greek War of Independence and the 