“The King of Denmark, wishing to commemorate the millennial anniversary of Iceland, signed a new constitution for Iceland on the 5th of January.”
millenarian
(Christianity) Pertaining to the belief in an impending period of one thousand years of peace and righteousness associated with the Second Coming of Christ. [from 17th c.]
Pertaining to any of various religious or social movements which believe in a coming radical change to existing world order; utopian, apocalyptic. [from 20th c.]