False Dmitriy I (Russian: Лжедмитрий; other transliterations:Dimitri, Dimitrii, Dimitriy, Dimitry, Dmitri, Dmitrii, Dmitry) was the Tsar of Russia from 21 July 1605 until his death on 17 May 1606 under the name of Dimitriy Ioannovich (Russian: Димитрий Иоаннович). He is sometimes referred to under the usurped title of Dmitriy II. He was one of three impostors who claimed during the Time of Troubles to be the youngest son of Ivan the Terrible, tsarevitch Dmitriy Ivanovich, who had supposedly escaped a 1591 assassination attempt. It is generally believed that the real Dmitriy was assassinated in Uglich and that this False Dmitriy's real name was Grigory Otrepyev, although this is far from certain.