He represented Monaco in the 1964 Eurovision Song Contest with "Où sont-elles passées" and finished 3rd.
In 1968, Romuald represented Andorra at the III International Song Festival held at the Maracanazinho Stadium in Rio de Janeiro, Brazil.
The following year, he represented the same country in the same festival and finished fifth again with the song "Tous les printemps du monde" (S. Lebrail/P.
In February 1973, Romuald represented France with "Laisse-moi le temps" in the XIV International Song Festival in Viña del Mar, Chile, where he finished 2nd and got the prize for the Best Singer.
Some months later, Paul Anka bought the rights of the song from the authors (Michel Jourdan [fr]/Caravelli), and along with Sammy Cahn composed lyrics in English, giving it to Frank Sinatra, who made it famous all over the world as "Let Me Try Again" (from Ol' Blue Eyes Is Back, Reprise Records, October 1973).