LUXEMBOURG (AP) — Grand Duke Henri of Luxembourg will abdicate the throne after 25 years Friday in favor of his eldest son, Guillaume, who will become head of state of the tiny duchy at the heart of Europe.

The 70-year-old current monarch will abdicate in a ceremony at the Grand Ducal Palace, built of yellow stone and decorated with spires and ironwork. Then Guillaume, 43, will be crowned and swear an oath to Luxembourg’s constitution before the 60 elected members of the Chamber of Deputies, the duchy’s parliament.

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