Marcin Knackfus (Lithuanian: Martynas Knakfusas, ca. 1742 – ca. 1821) was a Polish–Lithuanian Neoclassical architect of German descent. Born near Warsaw, he worked in the Grand Duchy of Lithuania and particularly in its capital Vilnius. He was a tutor of Laurynas Gucevičius.[1]
Knackfus was influenced by other Polish–German architects of late Baroque (Ephraim Schröger and Szymon Bogumił Zug) and early Neoclassicism (Domenico Merlini and Johann Christian Kammsetzer).[2] He moved to Vilnius around 1768. Knackfus served as captain of the Army of Grand Duchy of Lithuania and lectured at military engineering school.[3] Between 1773 and 1777 he taught courses in theory and practical application of architecture at Vilnius University.[4] He participated in the 1794 Kościuszko Uprising. Fearing persecutions of the Tsarist authorities, he retreated to Suvalkija and largely retired.[5]
His works include Verkiai Palace (1769–1781),[6] Palace of de Reuss in front of the Daukantas Square (1775),[7] expansion of astronomical observatory of Vilnius University (1782–1788),[8] late Baroque churches of Troškūnai (1774–1787) and Kurtuvėnai (1783–1792),[9] Vilnius Botanical Garden (1784),[3] altar for All Saints Church, Vilnius (1787),[9] St. Bartholomew Church in Užupis (1788),[10] supervision of the construction of the Green Bridge (1789),[11] church in Trakai (1789–1790),[9] Tyzenhaus Palace (around 1790), archives of the Lithuanian Tribunal (1790),[12] residential palace (presently used by Vilnius Conservatory of Juozas Tallat-Kelpša; 1790),[13] manor and park in Paežeriai, Vilkaviškis district (1794),[5] parish school in Troškūnai (1796),[5] Basanavičius street in Vilnius (1798).[14]
Knackfus worked with numerous nobles, including Bishops Ignacy Jakub Massalski and Ignacy Krasicki, Field Hetman Ludwik Tyszkiewicz, voivode Karol Stanisław Radziwiłł, Adam Kazimierz Czartoryski, Grand Marshal Stanisław Lubomirski.[15]