Upon the onset of a multitude of conflicts between Baekje and Goguryeo, he sent emissaries to improve relations and strengthen ties between Silla and the Chinese dynasties Sui and Tang.

The Samguk sagi describes King Jinpyeong as someone: big in stature, has a notable face and possessed great determination and sharp intellect as a youth.

)[4] Since King Jinpyeong was only 13 years old when he ascended the throne, Queen Dowager Sado, served as a regent until he reached the legal age.

Buddhism was embraced during this era, as King Jinpyeong actively sent envoys and monks to China to study and help in diplomatic relations.

As a result, King Jinpyeong sent thousands of soldiers to fight them back and built fortresses in Cheonsan, Sota and Wae Seok.

The bravery they have shown in their death raised the morale of Silla's army as a result, Baekje forces had no other choice but to retreat.

That same year, King Jinpyeong ordered Byeon Poom to take back Kajam fortress from the Baekje but failed to do so.

Seokpum was able to escape and run all the way to the Baekje border but the thought of his wife made him come back after exchanging clothes with a woodcutter, he was then arrested by the soldiers that were waiting for him at his house and was executed later on.

He established an independent era reign name in 584, the department Jobu (조부; 調府) to oversee taxes and obligatory labor, and Seungbu (승부; 乘府) to manage transport wagons and coaches.

Three officials were appointed to manage the major three palaces in 585, and in 586 the department Yebu (예부; 禮部) was established to oversee rituals and ceremonies.

In 588, he placed Ichan Sueulbu (이찬 수을부, hanja 伊飡 首乙夫) as the highest government official of Sangdaedeung, and a special department that looked after foreign diplomats, Younggaekbu (영객부; 領客府), was set up in 591.

[6][7] In 622, King Jinji's son Kim Yong Chun was appointed as the first Naeseongsasin (내성사신; 內省私臣), the official who managed the three major palaces.

[8] King Jinpyeong was a fervent advocate for Buddhism, and many monks made travels to China during his rule while serving diplomatic roles.

[10] These emissaries to China including Buddhist monks were continuously sent during King Jinpyeong's reign, and the two countries remained on amicable terms.

In 608, when Silla was under attack from Baekje and Goguryeo, King Jinpyeong asked for the Sui's aid, with requests written by the monk Wongwang.

Gifts were sent with emissaries to Tang in 621 and the Emperor Gaozu sent silks, folding screens of art with an official statement in return.

[8] Although King Jinpyeong focused on reinforcing defense by building forts and fortresses and strengthening the military system, Silla was in constant conflict with its two neighbors, Baekje and Goguryeo.

The aid from Sui came after Silla had lost many people and fortresses, and ultimately the joined forces failed in deterring Goguryeo attacks.

[8] Conflicts with Baekje escalated in 611, when they attacked the fortress of Gajam (가잠성; 椵岑城) and claimed it after a brutal battle of 100 days.

The ruling nobility frequently held conflicting political views; when King Jinpyeong designated his daughter Princess Deokman as his heir the division grew even deeper, as many nobles were opposed to the idea of having a queen.

[17][18] Political dissension reached its peak in May 631, when Ichan Chilsuk (이찬 칠숙) and Achan Seokpum (아찬 석품) plotted an uprising based on their opposition to having Princess Deokman as their next ruler.

[18][19][20] With the rebellion put down, power was left mainly in the hands of the King's supporters (the most important of them was Kim Yushin, Commander in Chief of the Royal Army from 629), and it was in this political atmosphere that Princess Deokman was able to become Queen.

Along with the 9 story pagoda and statue of Buddha at the temple Hwangnyongsa, the jade belt is considered one of the three main treasures of Silla.

[1] The first record of coal in Korea is in the Samguk sagi, where there is a description of a "fire burning under the ground of Mojiak (모지악; 毛只嶽) for 9 months during the reign of King Jinpyeong in the year 609".