Three Ages of Buddhism in the context of "Shakyamuni Buddha"

Maitreya (Sanskrit) or Metteyya (Pali) is a bodhisattva who is regarded as the future Buddha of this world in all schools of Buddhism, prophesied to become Maitreya Buddha or Metteyya Buddha. In some Buddhist literature, such as the Amitabha Sutra and the Lotus Sutra, he is also referred to as Ajitā (Invincible, Unconquerable). In Tibetan Buddhism he is known as the "Lord of Love" or the "Noble Loving One" (Pakpa Jampa). The root of his name is the Sanskrit word maitrī (Pali: metta; meaning friendliness, loving-kindness). The name Maitreya is also related to the Indo-Iranian name Mitra. In Hinduism, Maitreya is prophesied to be the king of Shambala, which is also the birthplace of the Kalki Avatar.

In all branches of Buddhism, Maitreya is viewed as the direct successor of Gautama Buddha. As the fifth and final Buddha of the current kalpa (eon), Maitreya's teachings will be focused around re-establishing the Buddha's Dharma on Earth. According to scriptures, Maitreya's teachings will be similar to those of Gautama (Shakyamuni). The arrival of Maitreya is prophesied to occur during an era of decline when the teachings of Gautama Buddha have been disregarded or obliviated.

Hōnen (法然; Japanese pronunciation: [hoꜜː.neɴ], May 13 (April 7), 1133 – February 29, 1212), also known as Genkū, was the founding figure of the Jōdo-shū (浄土宗; "Pure Land School"), the first independent branch of Japanese Pure Land Buddhism.

Hōnen became a Tendai initiate at an early age, but grew disaffected and sought an approach to Buddhism that all people of all classes and genders could follow, even during the current Age of Dharma Decline. After reading Shandao's Commentary on the Amitāyus Contemplation Sūtra, Hōnen devoted himself to attaining birth in the pure land of Amitābha Buddha (Amida) through the practice of "recitation of the Buddha's name" (Jp: nembutsu) and to spreading this teaching among all people.