Guillaume IX
Guillaume IX (1071–1126) was a France troubadour, poet and writer.
Also recorded as William IX, Duke of Aquitaine; William IX.
Overview
The authority record associates the name with troubadoric poetry and medieval music. Works named in the authority record include Lyrical poems. VALÉORINE records this subject so that lots referring to it can be described consistently.
In detail
Duke of Aquitaine and Gascony and Count of Poitou
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“William IX of Aquitaine”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q5351: Guillaume IX
Consult the source