The Tregenna family make intermittent appearances in subsidy assessments for the St. Ives area from the early sixteenth century. They apparently derived their name from the barton of Tregenna, which lay south-west of the town, but whether this was Tregenna’s own home has not been established. He had presumably achieved adulthood by 1573, when he was recorded as being a capital burgess of St. Ives. In 1585 he was placed second in the town’s subsidy list, being notionally rated as worth £4 in land, and he retained this position in 1599 even though his rating fell to 40s. Tregenna took a prominent part in local affairs, organizing the Twelfth Night revels in 1588 and lending money to the parish of St. Ives in 1592. He is thought to have served as portreeve or head warden of St. Ives in 1597.
Around the turn of the century a dispute broke out between local fishermen, who used a system of land-based observers, or huers, to alert them to shoals near the coast, and two landowners in the St. Ives district who began prosecuting the huers for trespass. In January 1603, with the number of cases mounting, the town council decided to support the defendants financially. Tregenna was the first signatory to this resolution, and he also travelled to London on the town’s behalf, presumably to attend the Westminster courts, receiving £141 in expenses.
In November 1604 Tregenna and others approached Viscount Cranborne (Robert Cecil†) with a petition to the king, apparently requesting the incorporation of St. Ives. The town had the backing of its patron, the marquess of Winchester, but the initiative must have failed as a charter was not granted until 1639.
