Richard the Justiciar

He attained suzerainty over all the counties of Burgundy save Mâcon and by 890 he was referred to as dux (duke) and by 900 as marchio (margrave).

In 877, on Charles's death, Boso returned to France and confided the realm of Italy and the Duchy of Provence to Richard and Hugh the Abbot as missi dominici.

After taking Lyon, he besieged his brother's capital of Vienne, where he was joined by Louis, Carloman, and the emperor Charles the Fat.

Richard eventually drove Boso out in 882 and captured his wife Ermengard and children Engelberga and Louis, sending them as prisoners to Autun.

After the death of Charles the Fat in 888, Richard supported the claim of Duke Rudolph to be King of Upper Burgundy and married his sister Adelaide, daughter of Conrad II of Auxerre.

Map of the three parts in the old Kingdom of Burgundy , ca 900.
Duchy of Burgundy of Richard the Justiciar