Illuminandi is a seven-piece Polish band that performs a unique style of rock music in which heavy guitar riffs are as prominent as haunting cello and violin melodies. Although sometimes described as "folk metal" or "gothic metal", the band's sound does not easily yield to boundaries. Even though Illuminandi appeals to most melodic metal fans, their music also contains elements of extreme metal, classical music, European folk music, progressive rock, early music and even hardcore. The band was formed in 1998 in Dębica, Poland. The founding members were Jan Trębacz (clean vocals, guitar) and Aleksander Kozioł (guitar). Illuminandi's goal from the very beginning was to play heavy music with an uplifting message; with most of the members declared as Christians, the band's lyrics deal both with personal struggles seen through the eyes of faith and spiritual life.

The band's discography consists of two albums and one extended play (EP):
- The Beginning (2005), Bombworks Records (compilation of demos and live tracks)
- Illumina Tenebras Meas (2007), Mocne Ramię Records (EP)
- In Via (2010), Ars Mundi (LP)

Although, having existed for almost 12 years now, Illuminandi cannot boast a rich discography, they have definitely won the hearts of many listeners in Poland and abroad. The band has performed at festivals in Poland, Germany, Czech Republic, the Netherlands, Switzerland and Ukraine, sharing the stage with many well-established rock and metal bands.
The band's latest album In Via (Latin for "on the way") features guest performances from members of Celtic band Open Folk (Paweł Iwaszkiewicz - recorders, shawm) and Polish avant-garde folksters Żywiołak (Robert Jaworski - hurdy gurdy) as well as two former Illuminandi vocalists. The CD was mastered by Polish mastering legend Grzegorz Piwkowski. "In Via" was released on Ars Mundi on May 28 2010.