Lag b’Omer begins tonight at sundown tonight. It is the date of the passing of Rabbi Shimon Bar Yochai, a Jewish scholar and mystic who lived from 100-160CE. His commentaries and teachings are part of important Jewish texts about law, ethics and mysticism. He wrote the Zohar, the foundational text of the Jewish mystical tradition known as Kabbalah.
He defied the Roman Emperor Hadrian who persecuted Jews, closed all Jewish schools and forbade the study of holy texts. To avoid execution by the Romans because of his disobedience, Rabbi Shimon and his son, Elazar, hid in a cave for 13 years in the village of Meron, northern Israel.