Saint Unni was an archbishop of Hamburg-Bremen (916–936). He died as a missionary in Birka

Birka

During the Viking Age, Birka , on the island of Björkö in Sweden, was an important trading center which handled goods from Scandinavia as well as Central and Eastern Europe and the Orient. Björkö is located in Lake Mälaren, 30 kilometers west of contemporary Stockholm, in the municipality of Ekerö...

 in Sweden, where he tried to continue Ansgar

Ansgar

Saint Ansgar, Anskar or Oscar, was an Archbishop of Hamburg-Bremen. The see of Hamburg was designated a "Mission to bring Christianity to the North", and Ansgar became known as the "Apostle of the North".-Life:After his mother’s early death Ansgar was brought up in Corbie Abbey, and made rapid...

's work.

According to Adam of Bremen

Adam of Bremen

Adam of Bremen was a German medieval chronicler. He lived and worked in the second half of the eleventh century. He is most famous for his chronicle Gesta Hammaburgensis Ecclesiae Pontificum .-Background:Little is known of his life other than hints from his own chronicles...

, his body was buried in Birka, but his head was entombed in Bremen Cathedral

Bremen Cathedral

Bremen Cathedral , dedicated to St. Peter, is a church situated in the market square in the center of Bremen, in northern Germany. The cathedral belongs to the Bremian Evangelical Church, a member of the Protestant umbrella organisation named Evangelical Church in Germany...

. When the altar was taken down in 1840, a leaden plate was found with the inscription "VNNIS ARCHIEP(is)-C(opus)". After Ansgar and Rimbert of Turholt

Rimbert

Saint Rimbert was archbishop of Bremen-Hamburg from 865 until his death.A monk in Turholt , he shared a missionary trip to Scandinavia with his friend Ansgar, whom he later succeeded as archbishop in Hamburg-Bremen in 865...

, epithet

Epithet

An epithet or byname is a descriptive term accompanying or occurring in place of a name and having entered common usage. It has various shades of meaning when applied to seemingly real or fictitious people, divinities, objects, and binomial nomenclature. It is also a descriptive title...

ised Apostle of the North and second Apostle of the North, Unni is revered as third Apostle of the North and as Saint.