Sunyer was apparently married by 917, and later appears with wife Richilda of Toulouse, speculated to have been a daughter of the Count of Rouergue based on the introduction of novel names into the family.

[1] Sunyer made important efforts with domestic politics, protected the church and strengthened its institutions by giving it more land and income.

In 912, Muhammad al-Tawil, the Wāli of Huesca and Lleida, attacked and destroyed the Barcelonian army under Sunyer in the Tàrrega valley.

The Moors temporarily abandoned Tarragona (which became a no-man's land), while Tortosa was forced to pay a tribute to the count.

In 947 Sunyer retired to monastic life and ceded the government of his realms to his sons: Borrell II and Miró I.