The country’s 601-member body, which was elected last month, is set to meet on Wednesday for the first time to rewrite the country's constitution.
The meeting is set to remove King Gyanendra, Nepal's Hindu monarch, along with his 240-year-old Shah dynasty.
The elections saw the country's Maoists win the large bloc of seats in the assembly.
Earlier on Monday Nepalese authorities banned protests around King
Gyanendra's palace and private residence to prevent violence ahead of the formal abolition.