Humayun in Guru Angad's Court

Guru Nanak's sons Baba Sri Chand Ji and Lakhmi Das Ji could not digest the Guru's seat being awarded to someone else. They had presumed that one of them would inherit the seat some day. They whined and complained. Nanak calmed them and explained that 'Guru Gaddi' (Guru's seat) was not a king's seat. It had to be earned through service and devotion.
On Asu Vadi 5, Sammat 1596 Bikrami, Lahna Ji was handed over the holy seat and he became 'Guru Angad Dev Ji', a part of Guru Nanak. Guru Nanak then urged Guru Angad to shift to Khadoor Sahib and continue to work for the cause of religion. Nanak descended into eternal realms on Asu Vadi 10, Sammat 1596 Bikrami.

Humayun in Guru Angad's Court

Guru Angad shifted from Kartarpur to Khadoor Sahib and started working according to Guru Nanak's mission. Sikh Sangat began to flock to Khadoor Sahib to catch a glimpse of their Guru. Guru Angad was ever absorbed in remembrance of the supreme God. He enlightened the Sikh community with verses of Nanak's divine utterances. In those very days there was chaos in the capital territory of India. Sher Shah Suri had captured Humayun's (Babar's son) throne by defeating him in the battle field. Humayun was in search of such a divine soul who could guide him to gain his kingdom back. While he was escaping to Kabul through Punjab someone advised him to visit Guru Angad, the blessed one.
When Humayun reached Guru Angad's court, the Guru was absorbed in divine contemplation. So Humayun had to wait. Though he had lost his kingdom, his ego was still inflated enough to make him feel below dignity in having to wait for someone. He was so furious that he uncovered his sword to aim at the Guru; but as he lifted his arm to make the blow, his shoulder froze and his arm locked in an upright position. He struggled to move but was helpless. By this moment Humayun was aware of the Guru's might and power, and stood humbly before Him. Guru Angad Dev Ji urged him to remember Allah and revealed that it was the key to regain his lost power. Some years hence Humayun succeeded in winning back his kingdom with Guru's grace. His son Akbar also developed a deep faith in Guru's seat.