The administration of all the fiscal, prudential and municipal affairs of any city, and the government thereof, shall be vested in one principal officer called mayor, a board of aldermen, and a common council, and the said mayor and aldermen and common council, in their joint capacity, shall be called the city councils.
RSA 44:3
1846, 384:2. 1855, 1699:2. GS 40:3. GL 44:3. PS 46:3. PL 50 :3. RL 62:3.