In addition there is evidence that the Minden monk, Landolf, undertook missionary work in the 9th century in the Örtze valley.

[2] On the spot where, today St. Peter and St. Paul's now stands, a baptistry had been built in the period between 800 and 900 A. D. by the Christian mission sent out from Minden on a sandy loess island near the thingstead of the Muthwidde Gau.

In addition to the aforementioned eight old farmsteads (Einzelhöfe), there were also various so-called Sattelhöfe, tenant farms, at Oldendorf, Beckedorf, Schlüpke and Weesen, which had to provide manpower for the castle.

The name of the settlement was derived from its likely founder, the Saxon margrave, Hermann Billung, a vassal of Otto I, and the aforementioned castle or Burg.

The foundation of the village about the year 940, is based on the fact that between the church and the castle an estimated 10 cottages (Kötnereien) and several smallholders (Kleinbauern) and tradesmen had settled.

Thereafter the country was ruled by the House of Welf, whose lordship lasted until 1866, with short interruptions during French occupation in the Seven Years' War (1756–1763) and the period of the Kingdom of Westphalia (1807–1813).

[5] In 1973 Hermannsburg held its millennium celebration on the occasion of the 1,000th anniversary of the death of Hermann Billung (27 March 973).

Since 1846, at Epiphany (6 January) at irregular intervals, and once a year since 1851, on Nativity of Saint John the Baptist (24 June), the mission festival is held, to which up to 6,000 came.

The new building was erected somewhat further south of the old church, as has been confirmed during excavation work which revealed a thick, charred layer of charcoaled wood.

Due to its poor structural condition and the growing number of parishioners, it was decided to greatly extend the church building.

The side aisles, each with six subdivisions, and the tower, built in the form of a turret, give the church a distinctive appearance.

Inside, the vaulting ribs in the ceiling are modelled on those of its Gothic predecessor and the large side windows give the church a lot of natural light.

The oldest inventory items are the wooden baptismal font and a painted chandelier also made of wood, both from the 18th century.

The remaining furniture, the altar, pulpit, organ and the 26 mounted brass chandeliers around the nave give an impression of the typical church art of the 1950s.

Theodor was the brother of Louis Harms, who had been removed from office by the Lutheran state church and had to leave the parish.

On 13 February 1878 a large number of people decided to withdraw from the state church and founded the Great Cross parish.

On 16 April the Great Cross parish separated from the Hanoverian Evangelical-Lutheran Free Church, a predecessor of the SELK.

Hermannsburg resident, Robert Brand, started up a theatre group which regularly puts on new plays.

On the museum land, several historic objects have been rebuilt: a Bienenzaun beehive, an historic clay oven (from Diesten), a double storage barn from the 17th and 18th centuries (from Beckedorf), a meeting place with cobbled village square and a storage barn from the 17th century (from Scheuen).

Opposite the museum is the Ludwig Harms House, a conference centre with an exhibition, cafe, bookshop and "One World Shop".

These include several, like the male voice choir (founded 1888), the Volunteer Fire Service (1893)[7] and TuS Hermannsburg (1904) are older than 100 years.

The Südheide Running and Walking Day (Volkslauf und -Wandertag) is organised every spring (April/May) by the TuS Hermannsburg.

On the last weekend in May the Örtze-Ring and Ritterbund Hartmann von Aue stage a large medieval tournament.