The Our Lady of the Rosary Church Also Notre Dame Du Rosaire church is the name given to a religious building that is affiliated with the Catholic Church and is located in the town of Saint Peter Port in Guernsey, a dependency of the British Crown, part of the Channel Islands. The church follows the Latin or Roman rite and is located within the Roman Catholic Diocese of Portsmouth (Dioecesis Portus Magni) based in Portsmouth, England, UK.