The name ''Islamabad'' means ''City of Islam''. It is derived from two words: ''Islam'' and ''abad''. ''Islam'' refers to the religion of Islam, Pakistan's state religion, and ''-abad'' is a Persian suffix meaning ''cultivated place'', indicating an inhabited place or city. According to a history book by Muhammad Ismail Zabeeh, a school teacher from Arifwala known as Abdur Rehman Amritsari proposed the name of the city.