He was the eldest son of Henry VII with a Scar, Duke of Brzeg, by his first wife Helena, the daughter of Otto V, Count of Orlamünde.
His new wife was Margareta of Masovia, daughter of Duke Siemowit III and widow of Casimir IV of Pomerania.
Despite the considerable age difference between them, the brothers had a warm and close relationship for many years until the succession war at the beginning of the 15th century.
On 5 July 1396 Louis I the Fair give Henry IX the towns of Kluczbork, Byczyna and Wołczyn, on occasion of his betrothal with Anna of Cieszyn, daughter of Duke Przemyslaus I Noszak; but was only on 29 September (nine days after the marriage ceremony) when he was confirmed with the formal possession of their domains, who produced a rent of 2,000 fines.
Both brothers Henry IX and Louis II inherited the Duchy of Brieg and became co-rulers, but in October 1400 they decided to divided their lands.
Henry IX took the districts of Lubin (Lüben), Chojnów (Haynau) and Oława (Ohlau), and Louis II took Brzeg (Brieg).
Henry IX, in order to reunited the ransom for his brother, imposed to the inhabitants of Brzeg, as well of his own subjects of Chojnów and Oława an additional tax.
The needed sum of 4,000 fines was collected shortly after; however, Louis II wasn't returned to Silesia until the end of 1405.