It was also a period of intense immigration from Korea, horse riders from northeast Asia, as well as cultural influence from China, that had been unified under the Sui dynasty becoming the crucial power on the mainland
हा काळ कोरियाकडून प्रखर स्थलांतरित होणारा काळ, उत्तरपूर्व आशियातील घोड्यांच्या सवार, तसेच चीनचा सांस्कृतिक प्रभाव होता.