In 1980, Sweden became the first European monarchy to declare equal (full cognatic) primogeniture, meaning that the eldest child of the monarch, whether female or male, ascends to the throne. Other kingdoms (such as the Netherlands in 1983, Norway in 1990, Belgium in 1991, Denmark in 2009, and Luxembourg in 2011) have since followed suit. The United Kingdom adopted absolute (equal) primogeniture (subject to the claims of existing heirs) on April 25, 2013, following agreement by the prime ministers of the sixteen Commonwealth Realms at the 22nd Commonwealth Heads of Government Meeting.