Votary (noun)

1. A person who has taken a religious vow, especially a nun or a monk.
2. A person who is devoted to a particular pursuit, belief, or way of life.

Origin:

Late middle english: from old french, or from latin votarius, from votum "vow".

Examples:

1. The votary of the temple had devoted his entire life to the service of the deity.
2. She became a votary of Buddhism and spent several years in a monastery.
3. He was a votary of science and spent most of his life studying and researching.
4. The votary of the cult believed in the power of the ancient gods.
5. She was a votary of the arts and had devoted her life to promoting and supporting the arts.