Question: The ruler who the Welser were financiers for when they rose to great prominence in international high finance was born on what date? 
Sentence (from "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.
Relevant evidence: Yes