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Kūkai, also known as Kōbō-Daishi, was a revered Japanese monk who founded the Shingon school of Buddhism in the 9th century. He is often referred to as "Odaishi-sama" by Shingon followers as a respectful and honorific title, which signifies "great master" or "great teacher" and is used to express deep respect and reverence for his profound wisdom, teachings, and contributions to Buddhism and Japanese culture.