Another controversial historical account is that of Rani Karnavati of Chittor and Mughal Emperor Humayun, which dates to 1535 CE. When Rani Karnavati, the widowed queen of the king of Chittor, realised that she could not defend against the invasion by the Sultan of Gujarat, Bahadur Shah, she sent a rakhi to Emperor Humayun. The Emperor, according to one version of the story, set off with his troops to defend Chittor. He arrived too late, and Bahadur Shah had already captured the Rani's fortress. Alternative accounts from the period, including those by historians in Humayun's Mughal court, do not mention the rakhi episode and some historians have expressed skepticism whether it ever happened. Historian Satish Chandra wrote, ... According to a mid-seventeenth century Rajasthani account, Rani Karnavati, the Rana's mother, sent a bracelet as rakhi to Humayun, who gallantly responded and helped. Since none of the contemporary sources mention this, little credit can be given to this story ... Humayun's own memoirs never mention this, and give different reasons for his war with Sultan Bahadur Shah of Gujarat in 1535.