They are the evolution of Didot where the curve dominates the straight line. The x-height of the lower case letters has grown substantially and this makes the letters more legible from small sizes. The Katsoulidis family was presented with Apollonia family after a study that began in 1986, as part of research programs in Universities, which along with the design lasted until 1989. The new version released in 2010 is redesigned while new symbols and characters that are supporting fully the Western and Central European Character Set are added. The new version also includes 4 types of numbering (Lining, Tabular Lining, Old Style, Tabular Old Style).