For there shall arise false Christs,
and false prophets,
Matthew 24:24
Here's just one EXAMPLE:
"Alexander Dowie is of particular significance to the Ahmadiyya Muslim Community. Herein the Ahmadiyya find a sign of God and a proof of their founder, Mirza Ghulam Ahmad's claim to be the Promised Messiah and Mahdi.Dowie had claimed to be the forerunner of Christ's second
Mirza Ghulam Ahmad had claimed to be the coming of Christ in the spirit (as well as the promised Imam Mahdi), who would establish the final victory of Islam on earth.
Ahmad challenged Dowie to a prayer duel, which he rejected, stipulating that the false claimant would die in the lifetime of the truthful.
Dowie died in March 1907 and Ahmad died in May 1908." wikipedia