Islam in Poland
They were initially invited by the Grand Duke of Lithuania and settled in the areas of Vilnius, Hrodno, Trakai, and Kaunas in what is present day Lithuania, Belarus, and Poland. Because their customs and traditions evolved in their new environment, they became known as the "Lipka Tatars". Alas, because of the annexation of much of eastern Poland by the Soviet Union following World War II, less than 30,000 Lipka Tatars are Polish citizens today.