Giagaraccio was born in Sardinia and studied law in Sassari, but lectured on civil institutions at the University of Pisa from 1565 to 1567.
At a later point in life, he decided to return to the island, where he practiced law and taught jurisprudence for free in his hometown.
Giagaraccio was also interested in the humanities and became friends with the most famous Sardinian writers of his time.
To commemorate him, Gerolamo Araolla wrote a sonnet in Italian, onor di Sassari e delizia dell'Arno (Honor of Sassari and delight of the Arno).
His ancient surname, Giagaraccio, has transformed into the modern name Cesaraccio.