Jón Ögmundsson also known as John of Holar and Jon Helgi Ogmundarson, was an Iceland

Iceland

Iceland , described as the Republic of Iceland, is a Nordic and European island country in the North Atlantic Ocean, on the Mid-Atlantic Ridge. Iceland also refers to the main island of the country, which contains almost all the population and almost all the land area. The country has a population...

ic bishop

Bishop

A bishop is an ordained or consecrated member of the Christian clergy who is generally entrusted with a position of authority and oversight. Within the Catholic Church, Eastern Orthodox, Oriental Orthodox Churches, in the Assyrian Church of the East, in the Independent Catholic Churches, and in the...

 and local Icelandic saint. In 1106 he founded the episcopal see

Episcopal See

An episcopal see is, in the original sense, the official seat of a bishop. This seat, which is also referred to as the bishop's cathedra, is placed in the bishop's principal church, which is therefore called the bishop's cathedral...

 at Hólar

Hólar

Hólar is a small community located in the Skagafjörður district and situated in northern Iceland.-Location:Hólar is located in the Hjaltadalur valley, some from the national capital at Reykjavík. Hólar has a population of around 100...

 in the north of Iceland and served as bishop there until his death.

A religious purist, Jón made it his mission to uproot all remnants of paganism. This included changing the names of the days of the week. Thus óðinsdagr, "day of Odin

Odin

Odin is a major god in Norse mythology and the ruler of Asgard. Homologous with the Anglo-Saxon "Wōden" and the Old High German "Wotan", the name is descended from Proto-Germanic "*Wodanaz" or "*Wōđanaz"....

", became miðvikudagr, "mid-week day" and the days of Týr and Thor

Thor

In Norse mythology, Thor is a hammer-wielding god associated with thunder, lightning, storms, oak trees, strength, the protection of mankind, and also hallowing, healing, and fertility...

 became the prosaic "third day" and "fifth day".

Jón's names for the days are still in use in Iceland today but despite the success of this cosmetic reform it appears that Jón did not manage to uproot the memory of the heathen gods. More than a century after his death the Prose Edda

Prose Edda

The Prose Edda, also known as the Younger Edda, Snorri's Edda or simply Edda, is an Icelandic collection of four sections interspersed with excerpts from earlier skaldic and Eddic poetry containing tales from Nordic mythology...

 and Poetic Edda

Poetic Edda

The Poetic Edda is a collection of Old Norse poems primarily preserved in the Icelandic mediaeval manuscript Codex Regius. Along with Snorri Sturluson's Prose Edda, the Poetic Edda is the most important extant source on Norse mythology and Germanic heroic legends, and from the early 19th century...

 were written, preserving large amounts of pagan myth and poetry.

Jón was made a local saint by episcopal decree at the Althing

Althing

The Alþingi, anglicised variously as Althing or Althingi, is the national parliament of Iceland. The Althingi is the oldest parliamentary institution in the world still extant...

in 1200.