Evidence the Romans made pottery, brick and tiles in the Rowland's Castle vicinity has been uncovered, and this would have been aided due to the availability of suitable clay.

The site was damaged by the railway and quarrying in the 19th century, and now only the earthworks and a few small areas of wall remain.

[5] Rowlands Castle is a ward and a parish council area within the East Hampshire local government district.

There is just one significant First Hampshire & Dorset bus route which operates every two hours during core daytime and goes via Leigh Park, Havant and Denvilles to Emsworth.

It is an aisled church with transept and chapels with the east window being a stained-glass depiction of the Crucifixion by Francis Austin.

The rectors of Chalton were bound from very early times to find a chaplain at the chapel to say mass on Sundays, Wednesdays, and Fridays, and on double feasts throughout the year, and to administer the sacraments and other rites (except the burial of the dead) for the inhabitants of the hamlets of Idsworth "and Dene" (Horndean, or perhaps Finchdean).

Sir William Haughe, rector of Chalton, discontinued this practice in 1394 and so proceedings were taken against him in the Court of Arches by Richard Romyn, lord of Idsworth manor, and the rest of the inhabitants of the two villages before Thomas Stowe and Adam Uske, who decided that the rector was liable by custom to find a chaplain to minister in Idsworth Chapel.

[15]: 31–32 In 1994 Stage 5 of the Tour de France passed through Rowland's Castle, attracting large crowds with its carnival atmosphere.