The land was the property of Barking Abbey until the Dissolution of the Monasteries when Henry VIII appropriated the land. It has been Crown property ever since being set aside by him for hunting and was known as Marylebone Park.
in 1811 the Prince Regent (later King George IV) commissioned architect John Nash to create a masterplan for the area. Nash originally envisaged a palace for the Prince and a number of grand detached villas for his friends, but when this was put into action from 1818 the palace and most of the villas were dropped. However the proposed terraces of houses around the fringes of the park were built.The Regent Park scheme was integrated with other schemes built for the Prince Regent by Nash, including Regent Street and Carlton House Terrace in a grand sweep of town planning stretching from St. James's Park to Parliament Hill. The park was first opened to the general public in 1835, initially for two days a week.
Queen Mary's Gardens in the Inner Circle were created in the 1930s, bringing that part of the park into use by the general public for the first time. The site had originally been used as a plant nursery and had later been leased to the Royal Botanic Society.
To get to Regents Park from the American; turn left into Ivor Place and at the use the crossing to get to the other side of Park Road.
Walk to the right when you have crossed the road and you will see the entrance to the park on your left when you get to the Barclay Cycle Hire station.