The Thaler (or Taler or Talir) was a silver coin used throughout Europe for almost four hundred years. Its name lives on in various currencies as the dollar or tolar. Etymologically, "Thaler" is an abbreviation of "Joachimsthaler", a coin type from the city of Joachimsthal (Jáchymov) in Bohemia, where some of the first such coins were minted in 1518. (Tal is German for "valley". A "thaler" is a person or a thing "from the valley". In the 1902 spelling reform, the German spelling was changed from "Thal" and "Thaler" to "Tal" and "Taler", which, however, did not affect the spelling of "Thaler" in the English language. Tolar is thaler in Czech language)
Read more about Thaler: Origin, The Joachimsthaler, Later German Thaler, Dutch Daalder, Scandinavian Taler, Other "Thaler", Legacy, Chronology of Thaler Development