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Al bon rey q'es reys de pretz car was usually dated to 1269, but is more likely to have been written later, between February 1271, when Pope Gregory X arrived in Rome, and September 1273, when Rudolf of Habsburg was elected King of Germany, since the sirventes mentions a pope (there had been a vacancy since 1268) and does not mention Rudolf's claim to the Empire.
Gottfried I of Sayn from the House of Sponheim (1247-1283/84) transferred his castrum Homburg to the German King Rudolf of Habsburg, in order to place it under his protection.