Bahadur Shah was succeeded by Jahandar Shah.

Explanation:
Bahadur Shah, also known as Bahadur Shah I, was the seventh Mughal emperor of India. He ruled from 1707 to 1712. After his death, there was a succession crisis within the Mughal Empire, leading to a power struggle among his sons and other contenders for the throne.

The Succession Crisis:
After Bahadur Shah's death, his eldest son Muazzam was declared the rightful heir and ascended the throne as Bahadur Shah's successor with the title Muhammad Shah. However, Muhammad Shah faced opposition from his half-brother Jahandar Shah, who was supported by some powerful nobles and military officials.

Reign of Jahandar Shah:
Jahandar Shah, the son of Bahadur Shah and his concubine, was enthroned as the emperor in 1712. His reign was marked by political instability, incompetence, and luxury. He was known for his extravagant lifestyle and lack of interest in governance. Jahandar Shah's reign was also marred by the influence of his favorite, Lal Kunwar, which further weakened his administration.

Role of the Syed Brothers:
During Jahandar Shah's reign, the Syed Brothers, Abdullah Khan and Hussain Ali Khan, gained significant power and influence. They played a crucial role in the administration and decision-making processes. However, their growing influence and control over the emperor led to resentment among other nobles and factions within the empire.

Overthrow and Death:
Due to his weak rule and the increasing dissatisfaction among the nobles, Jahandar Shah was overthrown in 1713 by Farrukhsiyar, another contender for the throne. Farrukhsiyar, with the support of the Sayyid Brothers, imprisoned Jahandar Shah and later executed him in 1714.

Conclusion:
In conclusion, Bahadur Shah was succeeded by his son Jahandar Shah, who ruled as the emperor for a brief period before being overthrown by Farrukhsiyar. Jahandar Shah's reign was marked by instability and misrule, contributing to the decline of the Mughal Empire.