Ten years later when the Joseon Dynasty was established in 1392 by her father-in-law, her husband was then given the royal title of Prince Jeongan; making her Princess Jeongnyeong (정녕옹주; 靖寧翁主) at the age of 27.
On 4 March 1400, King Jeongjong pronounced his brother Yi Bang-won as heir presumptive and voluntarily abdicated.
Queen Jeong is described as smart and ambitious and with an astute political ambition, who frequently intervened in state affairs.
[1][page needed] She assisted her spouse in his way to the throne and convinced him to appoint their eldest son Yangnyeong as crown prince.
In 1408, Min Je, the Queen's father, who had a hard time coping with the exile of his sons, died that same year.
It was during these times that the Queen's relationship with her husband was worsening with the concubines he brought to the palace due to alliances he formed with their clans.
Word spread and reached Taejong who saw it as a threat, which once again brought the brothers to be exiled and die by suicide poisoning.
But it is also said that rumors had spread through the palace that Queen Jeong had abused Taejong's concubine, Royal Noble Hyo of the Cheongpung Kim clan, and her son, Prince Gyeongnyeong.
Queen Dowager Hudeok, who made her husband king, but whose brothers were purged in return, died on 27 August 1420 at the age of 55 in Byeoljeon Hall, Sugang Palace.