Master Atiśa (燃燈吉祥智) - The originator of the Lamrim

Venerable Ru De started a series of videos on the life of Master Atiśa.

check it out here (in Chinese):

Some other relevant references from Wiki:

Venerable Ru De’s latest video on Master Atisa

Venerable Ru De shared something I found very useful for my own understanding of the various Teachings. He helped trace the lineage from the Bodhisattvas to the various Masters and to Master Atisa.

Watch the video from the 11 min mark: