Проверьте ошибки в вопросах: 1. who married the niece of the last byzantine emperor? 2.who was the first leader in russia? 3.in what year did ivan came to the throne? 4.who called himself the ruler of all russia? 5.in what year did prince vladimir converted to christianity?

1. Who married the niece of the last Byzantine emperor?
2. Who was the first leader in Russia?
3. In what year did Ivan come to the throne?    come
4. Who called himself the ruler of all Russia?
5. In what year was Prince Vladimir converted to Christianity?    was

3.In what year did Ivan come to the throne?
5.In what year did Prince Vladimir convert to Christianity?