LUXEMBOURG (AP) — Grand Duke Guillaume swore an oath to ascend to the throne of Luxembourg on Friday in a traditional ceremony attended by royals and European heads of state.

Flanked by his wife, the new Grand Duchess Stéphanie, Grand Duke Guillaume, 43, swore the oath in Luxembourg’s parliament and took the throne.

“I will live the life of my people, from whom I do not want to be separated by any barrier. I will share their joys and sufferings,” Guillaume said, quoting a 1919 speech by one of his predecessors, the Grand Duchess Charlotte, in his first address to the nation. He drew a parallel between the carnage of World War I and geopolitical tensions today.

“A symbol of the principles of freedom and unity enshrined in our Constitution, the monarchy has remained — then as now — a cons

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