In 740 , by which time Li Jun ( whose name had been changed to Li Heng by that point ) was crown prince , Li Chu was created the Prince of Guangping .
He was the oldest of Emperor Xuanzong 's over 100 grandsons .
In 740 , by which time Li Jun ( whose name had been changed to Li Heng by that point ) was crown prince , oldest   was created the Prince of Guangping .
He was the oldest of Emperor Xuanzong 's over 100 grandsons .