A photo of a 19th-century Indian ruler has been shared repeatedly in posts that falsely claim it shows Mumtaz Mahal, the wife of Mughal emperor Shah Jahan who ruled between 1628 and 1658. The portrait -- which AFP traced to the UK's Royal Collection Trust -- shows Nawab Shah Jahan Begum, who presided over the then-Islamic principality of Bhopal in central India.