This excursion followed two previous entradas dispatched in 1623 by his predecessor, Juan de Salinas, and led by a Timucuan chief for the same purpose.
In 1628 or early 1629, Rojas ordered a detachment of soldiers to fetch the subchief of the Pohoy, second in rank to the cacique, so that he "might give him gifts and negotiate a peace" between the two combatants.
[5] Rojas y Borgas probably founded the mission of San Diego de Helaca around 1627,[6][7] at the crossing on the east bank of the St. Johns river west of St. Augustine, to facilitate canoe traffic to the western provinces.
The first consisted of twenty soldiers and sixty allied Indians who explored the Apalache region; in the second, Torres traveled to the northern interior of La Florida as far as Cofitachqui, first visited by the Hernando de Soto expedition in 1539.
[8][9] In 1630, Inquisitor Agustin Ugarte y Saravia in Cartagena sent several blank commissions to Rojas y Borja for a commissioner and familiar, but apparently the governor never filled them.