ALAIN [IV] de Rohan, son of ALAIN [III] Vicomte de Rohan & his wife Constance de Penthièvre (-27 Oct 1205). "Alanus vicecomes de Rohan…cum uxore mea Constantia" founded the abbey of Bon-Repos, as a burial place for himself and "Alanus filius meus", with the consent of "Alano et Guillelmo filiis meus", by charter dated 23 Jun 1184[1423]. "Alanus vicecomes de Rohan...cum uxore mea Constancia" founded Bonrepos abbey for his own burial and that of "Alanus filius meus", with the consent of “Alano filio meo”, and donated property “in Britannia et in Anglia...in episcopate Eliensi...ecclesiam de Fuleburne...”, witnessed by “Herveo de Leon, Herveo filio Comitis...”, a second version of the document dated 20 Jun 1184 recording the consent of “Alano et Guillelmo filiis meis”[1424]. Vicomte de Rohan. "Alanus juvenis de Rohan" confirmed donations made to Bonrepos abbey, for the salvation of "Mabiliæ uxoris meæ", with the consent of “filiis meis Gaufrido et Conano et Alano”, by undated charter[1425]. Seigneur de Guéméné. "Alanus de Rohan" donated property to the abbey of Bon-Repos, with the consent of "Jocelino fratre meo…et filiis et heredibus meis Gaufrido, Conano et Alano", by charter dated 1204[1426].
m MABILE de Fougères, daughter of RAOUL [II] Sire de Fougères & his wife Mathilde ---. "Alanus juvenis de Rohan" confirmed donations made to Bonrepos abbey, for the salvation of "Mabiliæ uxoris meæ", with the consent of “filiis meis Gaufrido et Conano et Alano”, by undated charter[1427]. The primary source which confirms her parentage has not yet been identified.
Alain [IV] & his wife had [six] children