Phnom Penh - Cambodia's King Norodom Sihamoni on Tuesday endorsed a ceremony to mark the anniversary of the International Court ruling that awarded an ancient border temple to Cambodia over Thailand, according to a letter received Tuesday.

In a letter to the head of the Khmer Civilization Foundation, Moeung Son, the king congratulated their efforts to organize the June 15 ceremony and wished them success.

"I deeply thank you for this information and would like to admire this ceremony's organization to remember this event," the king wrote.

The foundation is a newly formed group of archeologists, business people, interested citizens and legal consultants formed to lobby for Cambodian interests of the once-disputed 11th century Preah Vihear temple perched on the Thai border.

King Sihamoni was a former ambassador for Cambodia to the United Nations Educational, Scientific and Cultural Organization (UNESCO).

Cambodia rejected an offer for Thailand to co-manage the Hindu temple that dates to the Khmer Empire, and asked UNESCO to list it as a World Heritage site.

Thailand disputes the border around the temple but seems to have resigned itself to the World Heritage listing after recent UN-brokered talks in Paris, although it remains a sensitive cross-border issue.

The temple, known as Prasat Phra Viharn by Thais, is sacred to both sides and was previously occupied by Thailand, but the International Court in The Hague ruled it to be Cambodian in 1962. (dpa)