The left panel of the Magic of Words triptych in this series shows prostitutes being inspired to change their ways by the preacher, Jan Milic.  
In one work in this series, a youth holds a book titled "Roma" next to an overturned seat of honor which represents a tumultuous meeting with a papal legate.  The only signed work in this series re-imagined a man's death as occurring in a chair by the sea at Naarden.  The faces of the men making an oath underneath a Linden Tree in this series were never painted in. Allegories of Peace and War float above Adam and Eve-esque human who cower near a sickle in its first entry. King (*) Wladyslaw inspects the carnage in its tenth panel, After the Battle of Grunewald.  The left panel of the Magic of Words triptych in this series shows prostitutes being inspired to change their ways by the preacher, Jan Milic.  These paintings hang in the Prague National Gallery and include a scene of Jan Hus preaching.  For 10 points, name this series by Alphonse Mucha about the title group of people.
In one work in this series, a youth holds a book titled "Roma" next to an overturned seat of honor which represents a tumultuous meeting with a papal legate.  
The Slav Epic [anti-prompt on The Magic of Words before mentioned]