This leader went on a "Grand Embassy" to the rest of Europe and defeated Charles XII of Sweden at Poltava, ending the Great Northern War.
This ruler's navy was victorious at the battle of Gangut, and this ruler's army put down the Bulavin rebellion in Astrakhan. This ruler, who suppressed a rebellion of a guard called the Streltsy, replaced a chief religious figure of his empire with the Holy Synod, and created a merit-based advancement system called the Table of Ranks. This leader went on a "Grand Embassy" to the rest of Europe and defeated Charles XII of Sweden at Poltava, ending the Great Northern War. For 10 points, identify this 6-foot-8 Russian tsar, whose program of modernization included the founding of a new capital at Saint Petersburg.
This ruler's navy was victorious at the battle of Gangut, and this ruler's army put down the Bulavin rebellion in Astrakhan.
Peter I [or Peter the Great; or Pyotr I; or Pyotr Veliki;, or Pyotr Alexeyevich Romanov; prompt partial answers]