After Ferdinand of the House of Saxe-Coburg and Gotha took over the throne of the Principality of Bulgaria, the country started to use Belgium's motto of "L'union fait la force" (in Bulgarian: Съединението прави силата). Although "Unity makes strength" meet in various projects on the coat of arms of Bulgaria in the post-liberation years, it officially became part of it only in 1927. After 1948, the motto dropped from the new Dimitrov Constitution, but remained on the facade of the National Assembly. Following the changes in 1989 and the adoption of a new Constitution of Bulgaria in 1991, the motto has been restored.