Historical Kdrama based on true story

Off the top of my head:

• Six Flying Dragons (the founders of Joseon Dynasty--royals Yi Song-gye, Yi Bang-won, and scholar Jeong Do-jeon in particular)
• Jang Ok Jun (a Joseon-era concubine with that name)
• The Nokdu Flower (leader of the Donghak Peasant Rebellion during the late Joseon era)
• Jewel in the Palace (Joseon's first female royal physician)
• Cruel Palace (infamous royal concubine Jo So-yong)
• Tree with Deep Roots (King Sejong)

In addition: 

• Dong Yi - story of San/Jeongjo's great grandmother and great grandfather
• Haechi - story of King Yeongjo aka San's Grandfather King
• Secret Door - story Crown Prince Sado aka San/King Jeongjo's Father. More of a rejustification/reimagined story of prince sado
• Yi San - another version and more political side of San/King Jeongjo's Story
• Empress Ki - story of empress ki, of korean descent but becomes the empress oin the Yuan Dynasty of china
• Jumong  - Story of Jumong was the founder of Goguryeo in 37 BC.
• Jeong Do Jeon - political drama one of the most powerful scholars and politicians of his time and a close supporter of King Taejo
• Jang yeongshil - story about popular scientist of in the 15th century
• The Jingbirok: A Memoir of Imjin War - story of 1604 by Joseon scholar