Sayn was a small German county of the Holy Roman Empire which, during the Middle Ages, existed within what is today Rheinland-Pfalz.
Count Henry II was notable for being accused of satanic orgies by the Church's German Grand Inquisitor, Conrad von Marburg, in 1233.
It is unknown whether it was Henry's Knights who killed Conrad on his return to Thuringia, but investigation was foregone due to the cruelty of Conrad, despite Pope Gregory IX ordering his murderers to be punished.
A lack of clear heirs of William III of Sayn-Wittgenstein-Sayn led to the temporary annexation of the comital territories by the Archbishop of Cologne until the succession was decided.
The ancestral land, lost in 1605, was on the right bank of the Middle Rhine around Sayn Castle, now part of the town of Bendorf.