By Norman times, the parish boundaries were firmly fixed and remain largely unchanged since.

[6] The Parish church, with its distinctive white pyramidal spire, is a notable landmark.

The parish is a first-level administrative division of the Bailiwick of Jersey, a British Crown dependency.

It has the highest point of the Grands Vaux valley, which terminates at its parish church.

The highest point of the island, Les Platons, is located in the north of Trinity.

In the Extente of 1274, the bay was recorded as Portus de Boley (Bouley Harbour).

In the 19th century it was considered for developing the main harbour for the island, but it was probably ruled out as impracticable because of the steep hills surrounding the bay.

As a parish, Trinity has historically been resistant to speed limits and traffic calming schemes.

For example, the parish has declined to introduce the green lane scheme with 15-mile-per-hour limits and priority to pedestrians and cyclists on its by-roads.

Finding the manor house in a ruined condition, he undertook an elaborate restoration (or "imaginative reconstruction", which has been criticised as turning the building into a French style château[16]).

[4] One of the surviving feudal duties of the holder of this fief is to present the Monarch with a pair of mallards when he or she visits the Island.

[17] Gerald Durrell, a British naturalist, writer and conservationist, opened Jersey Zoo, a wildlife conservation park, and founded the Durrell Wildlife Conservation Trust in the parish in 1959.

Among prominent natives of the parish (les Trinnetais) is Sir Arthur de la Mare (1914–1994), a retired ambassador and diplomat in Japan, Thailand and Singapore, who wrote Jèrriais literature in the Trinity dialect.