The first recording of Sebexen was on a document from the year 1139. the name form on the document is 'Sibechteshusen'.
On the 3. July 1145 archbishop Henry the I came to 'Sibethse' by request of the abbess Udalhilde from the Marien-monastery in Gandersheim to elevate the chapel in Sebexen to a parish church.
The first recording of Sebexen was on a document from the year 1139. the name form on the document is 'Sibechteshusen'.
On the 3. July 1145 archbishop Henry the I came to 'Sibethse' by request of the abbess Udalhilde from the Marien-monastery in Gandersheim to elevate the chapel in Sebexen to a parish church. The church's right of patronage of the church laid with the masters of Sebexen in the 14th-century. This nobility can only be testified in the 14th-century and became extinct in 1372 already.
On the 24. February 1430 the knave Henry of Gittelde announced the dissolution of the estate Sebexen with 150 florians.
The name development arrived after 'Sebechthusen' in 1294 on the name form 'Sebexen' very early on namely in 1442.
Sebexen was at times a border village. for centuries the village beck in Sebexen formed the border between the bishoprics Hildesheim and Mainz. At the beginning of the 16th-century the village belonged in parts to Brunswick-Grubenhagen, in parts to Brunswick-Wolfenbüttel