The set­tle­ment of Mir was first men­tioned in 1434, when it became the pri­vate estate of the Hospo­dar Mar­shal Sen­ka Gedigoldovich. Accord­ing to the will he drew up in 1451, the world pass­es to Anna But­ri­mov­na, his adopt­ed daugh­ter. In 1476, Anna trans­ferred Mir into life­long own­er­ship to Sen­ka Gedygoldovich’s wife, Milokhna, and after her death, to her cousin Yuri Ilyinich, under whom in the 20s. XVI cen­turies Con­struc­tion of the cas­tle began. The own­er of the World had good rea­sons for the con­struc­tion of such a pow­er­ful for­ti­fi­ca­tion. At the begin­ning of the 16th cen­tu­ry. Crimean Tatar raids on the lands of the Grand Duchy of Lithua­nia became more fre­quent. The unsta­ble polit­i­cal sit­u­a­tion was aggra­vat­ed by hos­til­i­ty between feu­dal fac­tions with­in the state. In par­tic­u­lar, the Ilinichs were on hos­tile terms with the very pow­er­ful and influ­en­tial prince of the Grand Duchy of Lithua­nia. Mikhail Glin­sky. There was anoth­er impor­tant rea­son for the con­struc­tion of the cas­tle. Yuri Ilyinich sought to obtain the title of count of the Holy Roman Empire, and one of the nec­es­sary con­di­tions for this was the own­er­ship of a stone cas­tle.