Italian bro. Trust me my fencing coach knows what he's talking about. He collects swords.
I bet he does
The rapier began to develop around 1500 as the Spanish espada ropera, or "dress sword".
Throughout the 16th century, a variety of new, single-handed civilian weapons were being developed, including the German Rappier, another cut-and-thrust weapon used for sportive fencing, as described in Joachim Meyer's Fechtbuch of 1570. 1570 is also the year in which the Italian swordmaster Signior Rocco Benetti first settled in England advocating the use of the rapier for thrusting as opposed to cutting or slashing when engaged in a duel. Nevertheless, the English word "rapier" generally refers to a primarily thrusting weapon, developed by the year 1600 as a result of the geometrical theories of such masters as Camillo Agrippa and Ridolfo Capoferro.
The etymology of the word rapier is uncertain. Charles du Fresne, sieur du Cange, in his Glossarium mediae et infimae Latinitatis, cites a form Rapperia in from a Latin text from 1511. He mentions an etymology deriving the word from the Greek ραπίζειν "to strike."[2] However, Walter William Skeat suggested that "rapiér" may derive from raspiére, a poker, and that this may be a contemptuous term developed by older cut-and-thrust fencers for the new weapon. The most probable root of this term, however, appear to be from the Spanish ropera that comes from ropa, or elegant dress, thus a "dress Sword".
By the year 1715, the rapier had been largely replaced by the lighter small sword throughout most of Europe, although the former continued to be used, as evidenced by the treatises of Donald McBane (1728), P. J. F. Girard (1736) and Domenico Angelo (1787).
http://en.wikipedia.org/wiki/RapierHe sure does know what he's talking about.
The Rapier was widely produced and used all over 16th century Europe. While it may be a Spanish derivative as an invention, it really can't be attributed to any one country.