Who married Charlotte Christine of Brunswick-Lüneburg?

Charlotte Christine Sophie also known as Sophie Charlotte or simply Charlotte (28 August 1694, in Wolfenbüttel – 2 November 1715, in Saint Petersburg), was the wife of Tsarevich Alexei Petrovich of Russia. She was the daughter of Louis Rudolph, Duke of Brunswick-Wolfenbüttel and Princess Christine Louise of Oettingen-Oettingen.

Tsarevich Alexei Petrovich of Russia (Russian: Алексей Петрович; 28 February 1690 – 26 June 1718) was the eldest son of Tsar Peter I and his first wife, Eudoxia Lopukhina.

Despite being heir apparent, Alexei frequently clashed with his father, undermining Peter’s efforts to groom him as successor and continue his Westernizing reforms. This conflict culminated in his brief defection to Austria, deeply offending the Russian monarchy and leading to punishments against him and his conservative followers. He was arrested upon his return and died under interrogation. Many historians believe that his death was a result of torture. Alexei's death left his infant half-brother, Peter Petrovich, son of Peter the Great and his second wife, Catherine, assuming the title of Tsarevich as the new heir to the Russian throne.