Centuries after Buddhism originated in Nepal, the Mahayana tradition arrived in China through the Silk Road in the 1st century CE via Tibet; it then entered the Korean peninsula in the 3rd century during the Three Kingdoms Period, from where it was transmitted to Japan. In Korea, it was adopted as the state religion of 3 constituent polities of the Three Kingdoms Period, first by the Goguryeo (also known as Goryeo) in 372 CE, by the Silla (Gaya) in 528 CE, and by the Baekje in 552 CE.