Why was Beijing called Beiping from 1928 to 1949?

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Map of eastern Asia highlighting China and its neighboring countries, with an arrow pointing to Beijing Municipality in northeastern China. The map includes international boundaries, disputed borders, and lines of control, and shows major surrounding countries such as Russia, Mongolia, India, Japan, North Korea, and South Korea. An inset at the bottom left shows the location of China within Asia. — Beijing Beijing city and municipality, China.

Beijing was renamed Beiping (meaning "Northern Peace") between 1928 and 1949 because the Nationalist government moved the national capital from Beijing to Nanjing.12

Following the success of the Northern Expedition in 1928, the Nationalist government established its capital in Nanjing, rendering the name "Beijing" ("Northern Capital") politically inaccurate. Consequently, the city was renamed Beiping to reflect its status as a non-capital city during that period. The name Beijing was restored in 1949 when the city was designated as the capital of the People’s Republic of China.12