Li Yi
It appeared that soon after arriving in the capital, Li Yi became a close associate to Li Jiancheng, who was then locked in a struggle with Li Shimin for power, as while Li Jiancheng was older and legally Emperor Gaozu's successor, Li Shimin was more famous, had contributed more to Tang's establishment, and enjoyed greater loyalty from the army. On one occasion, when Li Shimin sent messengers to Li Yi, Li Yi had them bound and battered, drawing Emperor Gaozu's ire. Emperor Gaozu briefly arrested Li Yi, but soon released and restored him. On another occasion in 624, Li Jiancheng, against Emperor Gaozu's regulations, requisitioned the elite soldiers from under Li Yi's command to augment his own guards, and when this was discovered, Emperor Gaozu rebuked Li Jiancheng and exiled his guard commander Keda Zhi (可達志).