Meir Simcha of Dvinsk (1843–1926) was a rabbi and prominent leader of Orthodox Judaism in Eastern Europe in the early 20th century. He was a kohen, and is therefore often referred to as Meir Simcha ha-Kohen. He is known for his writings on Maimonides' Mishneh Torah, which he titled Ohr Somayach, as well as his novellae on the Torah, titled Meshech Chochma.

Daugavpils is a state city in southeastern Latvia, located on the banks of the Daugava River, from which the city derives its name. The parts of the city to the north of the river belong to the historical Latvian region of Latgale, and those to the south lie in Selonia. It is the second-largest city in the country after the capital Riga, which is located some 230 kilometres northwest and is the ninth most populous city in the Baltic states.