Abecedarium (Abecedary)—along with Catechismus (Catechism)—is the first printed book in Slovene.[1] It is an eight-page booklet for helping people learn the alphabet. The protestant reformer Primož Trubar had it printed in 1550, with reprints in 1555 and 1566. An improved version of it was also printed by Sebastjan Krelj in 1566. Both Abecedarium and Catechismus are significant in the development of Slovene.[1]
Abecedarium was published in October 2008 for the first time in modern Slovene. This scholarly edition includes both the Trubar-era Slovene and a translation into modern Slovene with scholarly notes. Similarly, Catechismus was published in October 2009, the other "first" Slovene book. The "Pridiga o veri" (Sermon on Faith) from Catechismus is available in Slovene, English, German, and Esperanto.