Esoteric Buddhist practices (known as "milgyo", 密教) and texts arrived in Korea during the initial introduction of Buddhism to the region in 372 CE. Esoteric Buddhism was supported by the royalty of both Unified Silla (668-935) and Goryeo Dynasty (918-1392). During the Goryeo Dynasty esoteric practices were common within large sects like the Seon school, and the Hwaeom school as well as smaller esoteric sects like the Sinin ("mudra") and Ch'ongji ("Dharani") schools. During the era of the Mongol occupation (1251-1350s), Tibetan Buddhism also existed in Korea though it never gained a foothold there.