KATHMANDU (Reuters) - Nepal's King Gyanendra, facing imminent ouster from the throne, made perhaps his last royal public appearance at a shrine outside Kathmandu on Monday and offered annual prayers to Kali, the Hindu goddess of power.

The 60-year-old king was accompanied by Queen Komal to the temple of Dakshinkali perched by the side of a stream in a jungle-clad ravine 25 km (15 miles) south of Kathmandu.

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Gyanendra, facing the abolition of the 239-year-old monarchy after the Maoists emerged as the biggest party in assembly elections in April, offered prayers to the "family deity."

Prime Minister Girija Prasad Koirala, called the constituent assembly to begin its session on May 28, a parliament statement said, signaling an early end to the monarchy.

Under an agreement between the Maoists and the government, the first meeting of the assembly is supposed to declare an end to the monarchy and turn Nepal into a republic.

Earlier at the shrine, the king sat crossed-legged in front of the deity and offered prayers as five animals - a buffalo, a goat, a lamb, a duck and a rooster - were sacrificed to goddess Kali, a common practice among Hindus, to please the deity.

"This is a ritual for peace and prosperity for the self and the family," priest Sekhar Prasad Pandit said after performing the 45-minute ritual. "This is done in the hope to get one's desires fulfilled."

As the king arrived driving a black limousine dozens of people including some royalists cheered and offered him flowers.