Tchaikovsky
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Petr Fedorovich Tchaikovsky

Paternal grandfather of the composer (b. 1745 in Nikolaevka, near Poltava; d. 1818), born Petr Fedorovich Chaika (Петр Федорович Чайка, Petr Fedorovich Čajka, Pyotr Fyodorocivh Chayka); later known as Petr Fedorovich Tchaikovsky (Петр Федорович Чайковский, Petr Fedorovič Čajkovskij, Pyotr Fyodorovich Tchaikovsky).

He was the second child of Fedor Chaika (ca.1695–1767) and his wife Anna (1717–?). Petr studied in a seminary in Kiev, but he later received medical training in Saint Petersburg. From 1770 to 1777 he served as a physician's assistant in the army, later becoming a medical officer in Kungur (Perm' Region), before transferring to Viatka in 1782. Three years later he was included (as a member of the landless gentry) in the register of nobility instituted by Catherine the Great. He resigned from his medical dervice, and became a member of Viatka City Council in 1789, governor of Slobodskoi from 1795, later governor of Glazov. Recipient of the Order of Saint Vladimir (4th class). He was the first family member to adopt the name Tchaikovsky.

In 1776 he married Anastasiia Stepanovna Posokhova (b.1751), and they had eleven children: Vasilii (b. 1777); Evdokiia (b. 1780); Ekaterina (b. 1783); Ivan (b. 1785); Aleksandra (b. 1786); Petr (1789–1871); Anna (b. 1790, d. in early childhood); Mariia (b. 1792; d. in early childhood); Vladimir (1793–1850); Il'ia (1795–1880), father of the composer; and Olimpiada (1801–1874)