Who is reb shimon bar yochai?

Reb Shimon bar Yochai, a prominent 2nd-century Tanna, is revered in Jewish tradition as a key figure in the development of Kabbalah and Jewish mysticism. He is traditionally credited with authoring the Zohar, a foundational work of Kabbalistic thought, and is celebrated for his teachings on the nature of God and the soul. His life and teachings are commemorated on Lag BaOmer, a holiday marking his death, which is observed with bonfires and festive gatherings. Bar Yochai is also known for his opposition to Roman rule and his time spent in hiding with his son, where they studied and developed mystical ideas.