Dalkey (Irish: Deilginis, meaning "thorn island") is a suburb of Dublin and seaside resort just south of Dublin City, Ireland. It was founded as a Viking settlement and became an important port during the Middle Ages. According to John Clyn, it was one of the ports through which the plague entered Ireland in the mid-14th century. In modern times, Dalkey has become a thriving seaside suburb and a minor tourist attraction.