King George Tupou V of the South Pacific nation of Tonga has died at the age of 63.
He died at a hospital in Hong Kong with his brother, Crown Prince Tupouto'a Lavaka, at his side.
Reports say a period of mourning has begun in Tonga and a state funeral is being organised.
Tonga is the last Polynesian monarchy, although the king was instrumental in bringing about democratic reform.
He had been king since 2006.
The cause of King Tupou's death yesterday was not immediately known.