Mahdi will be the leader of Muslims when Dajjal (anti-Christ) will appear prior to the End of days, Jesus (pbuh) will return and join forces with Mahdi's army.
That's yet to happen.
There was quite a few 'Mahdi' claimants. One was in Sudan as already mentioned, and another was in India - Mirza Golam Ahmed Qadiani, founder of Qadiani/Ahmediyyas. But he went one step ahead, he claimed himself not only to be Mahdi, but simultaneously Jesus (pbuh) too.
The Mahdi never claimed to be of any sort of messiah that was coming and plus that was hes family name at the same,
Wasn't the man sentenced to death I recall after this situation, To be honest I read about this years ago in an article, Not to be some conspiracy theorist but the it looked like an inside job by the Saudis themselves, They were always trying to call in help from the west no matter what.
Hello everybody.The french special services had the opportunity to fight because some members of the group "ALEGIRAWATAKFIR"-it is the name we used-were decided to fight under the ultimate ball.The saudi forces were in the impossibility to eliminate them and began to have important losses.