Composers of ancient lore newly discovered in the last decade?

[Carlo Gesualdo]

I'm really enthusiastic when a classical composer of foreign lore is discovered especially, Think time span year 700 Notker Balbulus era to years 1000 A.D.

All these obscure names Adémar de Chabbanes, Hermann Der Lame,  Fulbert de Chartres, We don't know much about classical composer of the Gregorian era, the only theorist we are aware of Guido D'Arezzo, but there is no release of is since a theoretician.

Same goes whit long lost and forgotten Ars Vetus composer, since not mutch survive until this day, sometimes we are lucky to find a stone tablet or a good preserve scroll of music.

I wonder if we found out other musicians from year 700 a.d to the year 1000.

Are there other composers of these times we are now today aware of there existence and have releases of there works.