The State of Liang collapsed from internal problems in 641 BC,[4][5][6] and Duke Mu of Qin annexed the area completely.
His successors carried on the title until Liang's conquest by Qin in 225 BC but are generally known as the "Kings of Wei" today.
The Qin Empire was a unitary state following legalist policies but, upon establishing its Han successor, Liu Bang reïnstituted the previous fiefs and granted high titles to relatives and allies.
As Liang was a rich and important patch of territory, its princes were powerful and prominent: many met with untimely deaths either because they began to covet the imperial throne or because they were feared to do so.
A new and independent kingdom of Liang (梁王) was declared in 619 by Shen Faxing, a Sui general in the lower Yangtze.
Despite the name, his capital was at Piling (modern Changzhou) and he only ever controlled areas of present-day Zhejiang and Jiangsu before his territory was conquered by the agrarian rebel Li Zitong (under the title Emperor of Wu).
The title of prince of Liang (梁王) was revived a fourth time under the Yuan dynasty as a hereditary appanage for one of the sons of Kublai Khan.