Ulaan is red and Baatar is hero in Mongolian. In general, Ulaanbaatar means “red hero” and it was renamed when Mongolians declared a people’s republic a hundred years ago. There are 1.4 million people live in the city and it is considered as a modern city. The city had moved twenty five times between 17th to 19th centuries to many places along the Orkhon, Selenge and Tuul rivers. Ulaanbaatar was built at its present location and called the City of Felt. Later, the city became the foundation of the former Urguu, present Ulaanbaatar. The former names of Ulaanbaatar were Urguu (1639-1778), Ikh Khuree (1778-1910) and Niislel Khuree (1911-1921).