 The spread of the "kocsi szekér" has been linked by some theories personally to the king of Hungary Ferdinand I, the younger brother of Charles V who became the king of Spain, Emperor of Germany, and lord of the Burgundian Netherlands, in the 16th century, and who promoted the comfortable, spring-suspended wagons among the wealthy European nobility.A 16th-century German depiction of a "kocsi" without springs puts this theory in doubt, however, and it is uncertain whether the springs or some other feature were responsible for the spread of the word throughout Europe.The Thurn-und-Taxis-Post, the imperial post service, employed the first horse-drawn mail coaches in Europe since Roman times in 1650 –, as they started in the town of Kocs the use of these mail coaches gave rise to the term "coach".