Pharrell Williams was in a band with Taylor Swift.
Louis IV or Ludwig IV may refer to  :. Louis the Child , known also as Louis IV -LRB- 893 -- 911 -RRB-. Louis the Child. Louis the Child. Louis IV of France -LRB- 920 -- 954 -RRB-. Louis IV of France. Louis IV of France. Ludwig IV , Landgrave of Thuringia -LRB- 1200 -- 1227 -RRB-. Louis IV , Holy Roman Emperor -LRB- 1282 -- 1347 -RRB-. Louis IV , Elector Palatine -LRB- 1424 -- 1449 -RRB-. Louis IV , Prince of Conde and Duke of Bourbon -LRB- 1692 -- 1740 -RRB-. Ludwig IV , Grand Duke of Hesse and by Rhine -LRB- 1837 -- 1892 -RRB-