He gave land and money for the Market Hall, built to celebrate Queen Victoria's Diamond Jubilee in 1897.
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A great-grandson of Hywel ap Siencyn, he copied an important manuscript of cywyddau (British Library Additional MS 14866) which includes several poems to the Ynysymaengwyn family (amongst them the poem by Tudur Aled mentioned above).
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Ynysymaengwyn was inherited by Sir James and Elizabeth's daughter Bridget who married Robert Corbet (d. 1644), the third son of Sir Vincent Corbet of Moreton Corbet.
He was a grandson of Hywel ap Siencyn ab Iorwerth (d. 1494) of Ynysymaengwyn and was vicar of St Cadfan's Church in Tywyn between 1555 and his death in 1570.