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In page Alexei Petrovich, Tsarevich of Russia:

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Alexei and Charlotte had two children: Natalya Alexeyevna Romanova (21 July 1714 – 3 December 1728) and Peter Alexeyevich Romanov (23 October 1715 – 30 January 1730). Natalya died in Moscow at the age of 14 due to complications of tuberculosis.[2] Their son, Peter Alexeyevich, ascended the throne as Emperor Peter II in 1727. However, in 1730, he died of smallpox, resulting in the extinction of the direct male line of the House of Romanov.[citation needed]