Final answer:
The foundation stone of Harmandar Saheb during the reconstruction by the Taruna Dal was laid by Baba Deep Singh. Contextually, Guru Tegh Bahadur was a Sikh leader, and Emperor Ashoka promoted Buddhism. Shah Jahan's reign was marked by architectural accomplishments and religious tolerance.
Step-by-step explanation:
The foundation stone of Harmandar Saheb (Golden Temple) when rebuilt by the Taruna Dal was laid by Baba Deep Singh. This historical figure is revered in Sikh history for his dedication and service to the Sikh community. Baba Deep Singh was indeed one of the most honored martyrs in Sikh history and played a pivotal role in the rebuilding of the Harmandar Saheb after it had been destroyed several times during the 18th century conflicts.
To provide contextual information related to the question: Guru Tegh Bahadur, the ninth Sikh Guru, was a leader of the Sikh religion and was executed by the Mughal emperor Aurangzeb. The founder of Sikhism is Guru Nanak Dev Ji. As for the spread of Buddhism, it was Emperor Ashoka who after his conversion to Buddhism became a prolific promoter of the religion across his empire.
The Mughal empire under Shah Jahan, who was known for his significant architectural contributions including the construction of the Taj Mahal, continued to witness religious tolerance and patronage under his rule, a trait that was also notable in his father Jahangir's administration.