December 10, 1830 (Tenpō gannen (天保元年)) : In the 13th year of Bunsei, the new era name of Tenpō (meaning "Heavenly Imperial Protection") was created to mark the disasters of a great fire in Edo and an earthquake at Kyoto.The new era name was created from an hortatory aphorism: "Respect and worship the Ways of heaven. Eternally keep the Mandate of Heaven" (欽崇天道、永 …