claim: Sejong the Great passed away in 1450.
evidence: Grimoart -LRB- z -RRB- Gausmar -LRB- s -RRB- was a Gascon troubadour of the third quarter of the twelfth century .. Gascon. Gascony. troubadour. troubadour. The sole source of information about his life comes from a satire of Peire d'Alvernhe , which mentions that Grimoart was a knight and jongleur .. Peire d'Alvernhe. Peire d'Alvernhe. knight. knight. jongleur. jongleur. Only one known poem by Grimoart has survived .. The poet names himself in its last lines  :. Grimoart 's work is misattributed in two manuscripts to Jaufre Rudel .. Jaufre Rudel. Jaufre Rudel. The misattribution probably stems from the similarity between the first lines of two works  : Lanquan lo temps renovelha by Grimoart and Lanquan li jorn son lonc e may by Rudel .. The influence of Marcabru comes across in the poem of Grimoart .. Marcabru. Marcabru. A hypothesis has been forwarded that Grimoart Gausmar is a corruption of the name of another troubadour , Guilhem Azemar , which the copyist and later Peire got wrong .. troubadour. troubadour. Guilhem Azemar. Guilhem Azemar. It has not received widespread support .