Titus Coan (February 1, 1801 – December 1, 1882) was an American minister from New England who spent most of his life as a Christian missionary to the Hawaiian Islands.

[1] Their son Titus Munson Coan, born in 1836, became a physician who served in the American Civil War and died in 1921.

He learned the Hawaiian Language and helped educate the residents of the area and recruit them into Christianity.

When the United States Exploring Expedition visited Hilo in 1840–1841, Coan met the geologist James Dwight Dana.

[5] These contributed to Dana's development of the Hawaii hotspot theory for the geologic evolution of the island chain.

Both Fidelia and his second wife Lydia wrote a piece about the volcano, as well as his sons, Titus M. and Samuel.