London:  Queen Elizabeth II marked 60 years on the throne on Monday with a message thanking all those who have supported her over her reign and reaffirming her dedication to serving the British people.

Tributes from British officials poured in to honour the 85-year-old monarch on Accession Day. She ascended the throne when her father, George VI, died on February 6, 1952 and is the longest-serving monarch after Queen Victoria, who reigned for more than 63 years.

Before a year's worth of festivities to celebrate hermilestone, the queen said she and her husband have been "deeply moved" to receive so many kind messages about her Diamond Jubilee.

"I am writing to thank you for the wonderful support and encouragement that you have given to me and Prince Philip over these years," she wrote in a message to the nation. "In this special year, as I dedicate myself anew to your service, I hope that we will all be reminded of the power of togetherness and the convening strength of family, friendship and good neighbourliness, examples of which I have been fortunate to see throughout my reign."

The queen's Diamond Jubilee will be feted with a series of regional, national and international events throughout 2012.

Over the course of 2012, members of the royal family, including Prince William and his wife, the Duchess of Cambridge, will fan out across the globe and travel to Commonwealth countries including Canada, Jamaica and Belize.

The queen and Philip, also known as the Duke of Edinburgh, will stay closer to home, touring the UK from March to July.

(Agencies)