The ruler who the Welser were financiers for when they rose to great prominence in international high finance was born on what date? 
Welser: Welser was a German banking and merchant family, originally a patrician family from Augsburg, that rose to great prominence in international high finance in the 16th century as financiers of Charles V, Holy Roman Emperor. Charles V, Holy Roman Emperor: Charles V (Spanish: "Carlos" ; German: "Karl" ; Dutch: "Karel"; Italian: "Carlo" ) (24 February 1500 – 21 September 1558) was ruler of both the Spanish Empire from 1516 and the Holy Roman Empire from 1519, as well as of the lands of the former Duchy of Burgundy from 1506.
24 February 1500