706 BC. By the time Sargon moved to Babylon, Sennacherib, who served as the crown prince and designated heir, had already left Nimrud, living in a residence at Nineveh. Nineveh had been the designated seat of the Assyrian crown prince since the reign of Tiglath-Pileser. As crown prince, Sennacherib also owned an estate at Tarbisu. The royal educator, Hunnî, would have educated Sennacherib and his siblings. They probably received a scribal education, learning arithmetic and how to read and write in Sumerian and Akkadian. Sennacherib had several brothers and at least one sister. In addition to the older brothers who died before his birth, Sennacherib had a number of younger brothers, some of whom are mentioned as being alive as late as 670 BC, then in the service of Sennacherib's son and successor Esarhaddon. Sennacherib's only known sister, Ahat-abisha, was married off to Ambaris, the king of Tabal, but probably returned to Assyria after Sargon's first successful campaign against Tabal. Sennacherib's name, Sîn-aḥḥē-erība, means "Sîn (the moon-god) has replaced the brothers" in Akkadian. The name probably derives from Sennacherib not being Sargon's first son, but all his older brothers being dead by the time he was born. In Hebrew, his name was rendered as Snḥryb and in Aramaic it was Šnḥ’ryb. According to a 670 BC document, it was illegal to give the name Sennacherib (then the former king) to a commoner in Assyria, as it was considered sacrilege. Sennacherib as crown prince As crown prince, Sennacherib exercised royal power with his father, or alone as a substitute while Sargon was away campaigning. During Sargon's longer absences from the Assyrian heartland, Sennacherib's residence would have served as the center of government in the Neo-Assyrian Empire, with the crown prince taking on significant administrative and political responsibilities. The vast responsibilities entrusted to Sennacherib suggests a certain degree of trust between the king and the crown prince. In reliefs depicting both Sargon and Sennacherib, they are portrayed in discussion, appearing almost as equals. As regent, Sennacherib's primary duty was to maintain relations with Assyrian governors and generals and oversee the empire's vast military intelligence network. Sennacherib oversaw domestic affairs and often informed Sargon of the progress being made on building projects throughout the empire. Sargon also assigned him to the reception and distribution of audience gifts and tribute. After distributing such financial resources, Sennacherib sent letters to his father to inform him