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Mykhailo Tchaikovsky (29 September 1804, Halchyn, Zhytomyr district, Volyn province - 4 January 1886, Birky, Kozelets district, Chernihiv province), aka Mehmet Sadiq Pasha. Ukrainian nobleman, a descendant of Hetman Ivan Bryukhovetskyi. He participated in the November Uprising of 1830-1831, after which he was forced to fight his way across the then Russian Empire's border. In exile, he immersed himself in literary creativity and the world of adventure and intrigue. He initiated and participated in a coup d'état in Serbia to eliminate Russian influence in that country. He tried to organise an uprising in Bulgaria. He became a friend of Bosnian and Montenegrin elites and acted as their intermediary in relations with the High Porte. He emigrated to Istanbul. He gained influence at the Sultan's court and used it to create the Ottoman Cossack Corps. He fought against Russian troops during the Crimean War. He was the commandant of Bucharest. He sought the relocation of his Cossacks to the Caucasus in order to establish contacts with the Kuban people and open a new front.

Mykhailo Tchaikovsky wrote about such an adventurous life in Polish in two books: Memoirs of Sadiq Pasha and The Campaign on the Danube and in Muntenia during the Crimean War of 1854-1855. They are published in Ukrainian for the first time and the translation of the second part was made from the author's manuscripts, which were not previously published.