Unhappy with the growing Parthian influence at their doorstep, Roman Emperor Nero sent General Gnaeus Domitius Corbulo with a large army to the east in order to install Roman client kings (see Roman–Parthian War of 58–63). After Tiridates I escaped, Roman client king Tigranes VI was installed and in 61 he invaded the Kingdom of Adiabene, which was one of the Parthian vassal kingdoms.