The Kingdom of Iceland was an associated state of Denmark and kingdom under a personal union that was established by the Act of Union signed on 1 December 1918. It lasted until 17 June 1944 when a national referendum established the republic of Iceland in its place. The Parliament of Iceland asked that Denmark represent Iceland internationally, and day-to-day matters were delegated to a Danish plenipotentiary for Icelandic affairs based in Reykjavík, and – after the German invasion of Denmark in 1940 – a regent was appointed.