Sadiq al-Mahdi, Sudan's last democratically elected leader and the great-grandson of the messianic figure who fought the British in the 19th century, has died from the coronavirus, his party said on Thursday.The two-time prime minister who was a central figure in Sudan's political and spiritual life for more than half a century was being treated in the United Arab Emirates.Current premier Abdalla Hamdok described the 84-year-old as "one of the most important men of thought, politics, literature, and wisdom in our country," as the government declared three days of mourning.