Persecution and Reorganiz.ation 125 Shah Nawaz did not have a long term as governor of Lahore. Yahya Khan escaped from jail and appeaJed to his father-in-law, Wazir Qamamddin, to help him regain power in the Punjab. Shah Nawaz, on the advice of Adina Beg, invited Ahmed Shah Abdali, who had succeeded his master, Nadir Shah, as ruler of Afghanistan, to invade the country. While Zakarya Khan's sons were busy fighting each other, the Sikhs were quietly recouping their strength. After the general meeting of the Sarbat Khalsa on the first of Baisakh, 30 March 1747, they built a mud fortress just outside Amritsar which they named Ram Raum in honour of the founder of the city, Guru Ram Das.