Analysis of information sources in references of the Wikipedia article "Wang Mang" in English language version.
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(help)項羽起,封建孫安為濟北王。至漢興,安失國,齊人謂之「王家」,因以為氏。[Xiang Yu rose in power, an established An, grandson of King Jian of Qi as the vassal king of Jibei. When Han arose, An lost his vassalage, and the people of Qi called him "royal [Wang] family". So he took it as surname.]