It is one of the two churches for the Harran parish which is part of the Namdal prosti (deanery) in the Diocese of Nidaros.

[1][2][3] The site of Gløshaug Church has been used all the way back to around the year 1160.

A manuscript from 1597 ("Gaannske Nommedalls Leens Beskriffuelse") called the church "Olafshougs Kirke i Hærø fierding", meaning St. Olaf's Church of Harran.

[4][5][6] In the 1800s and 1900s, several Englishmen (some of those were noblemen) owned houses along the river at Gartland, where they lived during their stay in Grong.

One was Thomas Merthyr Guest, a man of considerable wealth.