Upon resignation of his post he gathered the local nobility and tribes within the Red River Valley (North Vietnam) mobilized the imperial troops and naval fleet of Jiaozhou and successfully expelled the Liang administration and led the insurrection that ended in 543.
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His immediate successor was Triệu Quang Phục (thereafter known as Triệu Việt Vương which means Trieu Viet King).
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In February 548, he relinquished imperial authority and transferred his power to his older brother Lý Thiên Bảo (co-ruler from 548 until his death in 555) and Triệu Quang Phục (r. 548–571), who was his best lieutenant and general.
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Lý Nam Đế was also strongly supported by famous military commander such as Phạm Tu, Triệu Túc, Tinh Thieu, and Triệu Quang Phục, (son of Triệu Tuc, later known as Triệu Việt Vương).
NAM | Nam June Paik | Viet Nam | Kim Jong-nam | Nam Định Province | Phi Pan Nam Range | Oysters at Nam Kee's | Oh Kil-nam | Nam Phan | Nam Ji-hyun | Nam-gu | Choe Nam-seon | Ocean View, Viet Nam | Nam Xan River | Nam tok (food) | Nam tok | Nam Theun 2 Dam | Nam Theun | Nam River | NAM (observer) | Nam Il | Nam Hae-il | Nam Gi-nam | Nam Doh-hyeong | Nam Dinh F.C. | Nam Đàn District | Nam Cheong Station | Nam Cao | Kim Nam-gil | Kim Hong-nam |
Lý Nam Đế decided to relinquish his imperial authority and transferred his power to his older brother Thiên Bảo and trusted lieutenant Triệu Quang Phục as co-rulers in his place with the intention of continuing the struggle against the Han.
After the assassination of Lý Nam Đế in 548, his elder brother, Lý Thiên Bảo, became the de facto ruler of Vạn Xuân.