Tegin Shah then abdicated in 739 CE in favour of his son, named on his coins "Fromo Kesaro", probable phonetic transcription of "Caesar of Rome". He was apparently named in honor of "Caesar", the title of the then East Roman Emperor Leo III the Isaurian who had defeated their common enemy the Arabs during the Siege of Constantinople in 717 CE, and sent an embassy to China through Central Asia in 719 CE which probably met with the Turk Shahis. The Chinese annals record that "In the first month of the seventh year of the period Kaiyuan [719 CE] their Lord (拂菻王, "the King of Fulin") sent an officer of high rank of Tokhara [吐火羅大首領 "T'u-huo-lo Ta-shou-ling")] (...) to offer lions and antelopes, two of each. A few months after, he further sent Priests of great virtue [大德僧 "Ta-te-seng"] to our court with tribute." In Chinese sources "Fromo Kesaro" was aptly transcribed "Fulin Jisuo" (拂菻罽娑), "Fulin" (拂菻) being the standard Tang Dynasty name for "Byzantine Empire" and Jisuo (罽娑) the phonetic transcription of "Caesar".