While this crisis was happening a young man called Grigory Otrepev arrived. He was a pretender. He said that he was Dmitry, Ivan’s youngest son who had been murdered in 1591. At the time people had said that it was an accident, caused by the boy’s epilepsy. But some people thought that Boris had murdered him (or ordered him to be murdered) so that he himself could become Tsar. The pretender said that he had actually escaped from the people who were trying to murder him. The pretender got lots of people on his side, including Poles and Cossacks. He marched towards Moscow. Boris’s armies tried to stop them, but then Boris died suddenly. Dmitri (as he called himself) was able to march into Moscow and (falsely) claim the throne.