The act of starting or founding something; the origin or initiation of an organization, doctrine, or system.
彼がこの学派を創始したとされている。
He is said to have founded this school of thought.
その寺院の創始は平安時代にさかのぼる。
The founding of that temple dates back to the Heian period.
会社の創始者について詳しく調べた。
I researched the company's founder in detail.