On the marriage of Charles II with Catherine of Braganza, Austin wrote two poems to celebrate the union, which were "presented to their majesties" on their passage down the Thames from Hampton Court to Whitehall (23 Aug. 1662).
It was dedicated to Charles II and George Monck, 1st Duke of Albemarle, and was a fulsome panegyric upon their achievements.
In an address to the reader it is stated that the poem was written at the request of "very worthy persons in the countrey at the time of the sickness when the mortality in London" reached "seven or eight thousand a week with some hundreds over and above."
Although Austin here dispenses with classical allusions and annotations, he employs a number of Latin and Greek words in a slightly anglicised form.
Austin was buried in the parish church of Southwark, near the monument of his father, but the year of his death is uncertain.