The only feudal dynasty in Vietnam had 2 kings ruling the country?

From 951 to 954, our country had two kings ruling the country at the same time. This lack of unity also laid the foundation for the chaos of the 12 warlords later on.

Source: https://vtc.vn/trieu-dai-phong-kien-duy-nhat-o-viet-nam-co-2-vua-cung-tri-vi-dat-nuoc-ar772284.html