Foundation
The school was founded in 1544 by Gilbert Lathum, a local clergyman (later Archdeacon of Man) who left £140 in his will to fund a schoolmaster (at a stipend of £7 per year) to run a free grammar school.
The school was first based in Church Street, opposite the Prescot Parish Church of St. Mary's. It then moved in 1760 to a site in High Street, where it remained until 1924. The next move was to the spacious site on St. Helens Road, accommodated in newly built wooden buildings which were originally intended to be temporary, but were expanded and augmented in the 1960s by a brick-built assembly hall ("Spencer Briggs Hall"), classrooms and purpose-built metalwork and woodwork workshops, and remained in use until 1978 when they fell victim to an arson attack by a disturbed former pupil.
Headteachers include C. W. H. Richardson, who ensured the school's survival during difficult times in the 1920s and 1930s, and R. Spencer Briggs from 1937 to 1963.
By 1944, when the Butler Education Act brought the school into the free national system, the school was in fact charging tuition fees. At this point, entry criteria passed from the ability to pay to the ability to pass the 11+ exam.
From the 1930s to the 1960s the school expanded under the leadership of headmaster R. Spencer Briggs to a peak of 650 boys. Briggs modelled his school superficially on the British public school model, with a 'house' system, prefects, school uniform, a heavy emphasis on games (particularly football and cricket), and indeed corporal punishment. There was also extracurricular activity: debating, amateur dramatics, choral and instrumental music, and school societies. During this period the school applied for and was granted its coat of arms. The Latin motto "Futuram civitatem inquirimus" translates as "Seeking society's future". In other words: "Looking forward".