the monk Lazar showing Vasily and two of his vassals the finished clock tower. Although the tower is gone, the illustration of the clock tower and monastery can be seen in the Polytechnical Museum in Moscow as of 2006. A 16th-century chronicle says that Lazar was paid 150 rubles for his work ("sta bole polutorasta rublev"). Legacy The Serbian Orthodox Church decided to celebrate the 600th anniversary of the monk Lazar's invention and construction of the great clock tower in the Moscow Kremlin on the feast of the Presentation of Mary (Ваведење) on 4 December 2004. The liturgies of the churches in Belgrade and Moscow, the Hilandar (where the brotherhood had their krsna slava) and the Monastery of the Holy Archangels, mentioned Lazar. A memorial sundial was placed on the Academy of the Serbian Orthodox Church in Belgrade. The Serbian mathematician Dr. Dragan Trifunović noted Lazar and his invention as part of Serbian mathematics of the Middle Ages, saying that "as a mathematician it was interesting how Lazar forged the clock. He had to have knowledge of Archimedes' division of circuit tracks and estimation of the extent to forge three types of gear wheels. I have proposed to the Kremlin to put up a plaque with an inscription where the clock tower once stood." Along with Pachomius the Serb, Lazar is one of the notable Serbs in Russian medieval history. See also List of Moscow Kremlin towers Teodosije the Hilandarian (1246-1328), one of the most important Serbian writers in the Middle Ages Elder Grigorije (fl. 1310-1355), builder of Saint Archangels Monastery Antonije Bagaš (fl. 1356-1366), bought and restored the Agiou Pavlou monastery Lazar the Hilandarian (fl. 1404), the first known Serbian and Russian watchmaker Pachomius the Serb (fl. 1440s-1484), hagiographer of the Russian Church Miroslav Gospel Gabriel the Hilandarian Constantine of Kostenets Cyprian, Metropolitan of Kiev and All Rus' Gregory Tsamblak Isaija the Monk Elder Siluan Grigorije of Gornjak Atanasije (scribe) Rajčin Sudić Nicodemus of Tismana Dimitar of Kratovo Marko Pećki Annotations Notes References 14th-century Serbian people 15th-century Serbian people 15th-century Russian people 14th-century Eastern Orthodox clergy 15th-century Eastern Orthodox clergy 15th-century architects 15th-century engineers Medieval Serbian Orthodox clergy People from Prizren People of the Serbian Empire People of the Serbian Despotate Serbian architects Serbian inventors Serbian monks Russian architects Russian inventors Russian monks Russian people of Serbian descent Clock towers People of the Grand Duchy of Moscow Medieval Athos