Question: Sir John Oldcastle, was an English Lollard leader, he escaped from which historic castle located on the north bank of the River Thames in central London, and it lies within the London Borough of Tower Hamlets?
Context: The London Borough of Bexley is a London borough in south-east London, England.  It has common borders with the London Borough of Bromley to the south, the Royal Borough of Greenwich to the west, across the River Thames to the north it borders the London Borough of Havering, the London Borough of Barking and Dagenham and there is a small boundary with the unitary authority of Thurrock in Essex to the north-east.  There is a border with Dartford borough to the east and Sevenoaks district to the south-east, both being in the ceremonial county of Kent.  The London Borough of Bexley is within the Thames Gateway, an area designated as a national priority for urban regeneration.  The local authority is Bexley London Borough Council. The Tower of London, officially Her Majesty's Royal Palace and Fortress of the Tower of London, is a historic castle located on the north bank of the River Thames in central London.  It lies within the London Borough of Tower Hamlets, separated from the eastern edge of the square mile of the City of London by the open space known as Tower Hill.  It was founded towards the end of 1066 as part of the Norman Conquest of England.  The White Tower, which gives the entire castle its name, was built by William the Conqueror in 1078 and was a resented symbol of oppression, inflicted upon London by the new ruling elite.  The castle was used as a prison from 1100 (Ranulf Flambard) until 1952 (Kray twins), although that was not its primary purpose.  A grand palace early in its history, it served as a royal residence.  As a whole, the Tower is a complex of several buildings set within two concentric rings of defensive walls and a moat.  There were several phases of expansion, mainly under Kings Richard the Lionheart, Henry III, and Edward I in the 12th and 13th centuries.  The general layout established by the late 13th century remains despite later activity on the site. Tower Hamlets First was a British political party represented in Tower Hamlets London Borough Council, which was launched to contest the 2014 local elections.  At the 2014 London borough council elections, it was the second largest party on Tower Hamlets Council and the fifth largest political party out of all London borough councils. The mayor of Tower Hamlets is a directly elected mayor of Tower Hamlets London Borough Council in east London, England.  The first election for this position occurred on 21 October 2010, taking on the executive function of the borough council.  The position is different from the previous largely ceremonial, annually appointed mayors of Tower Hamlets, who became known as the 'Chair of Council' after the first election and are now known as the 'Speaker of Council'.  The second election was held on 22 May 2014, the same day as the Tower Hamlets Council election, other United Kingdom local elections, and European Parliament elections, but the election result was declared void by the election court.  A by-election was held on 11 June 2015. Evelyn is an electoral ward in the northernmost part of the London Borough of Lewisham.  It is located in the Deptford area on the south bank of the River Thames, and is the only Lewisham ward that borders the Thames.  Occupying the northern corner of the London Borough of Lewisham, the Evelyn ward borders only one other Lewisham ward, which is "New Cross" to the south.  But Evelyn borders wards from three other London Boroughs, "Greenwich West" in the Royal Borough of Greenwich to the east, "Surrey Docks" of the London Borough of Southwark to the northwest, and across the River Thames on the Isle of Dogs, the "Millwall" ward from the London Borough of Tower Hamlets. Sir John Oldcastle is an Elizabethan play about John Oldcastle, a controversial 14th-15th century rebel and Lollard who was seen by some of Shakespeare's contemporaries as a proto-Protestant martyr. Wapping ( ) is a district in London Docklands, England, in the London Borough of Tower Hamlets.  It is situated between the north bank of the River Thames and the ancient thoroughfare simply called The Highway.  Wapping's proximity to the river has given it a strong maritime character, which it retains through its riverside public houses and steps, such as the Prospect of Whitby and Wapping Stairs. Cubitt Town is an area on the Isle of Dogs in Tower Hamlets in London, England.  It is on the east of the Isle, facing Greenwich across the River Thames.  To the west is Millwall, to the northwest Canary Wharf and to the north, across the Blue Bridge, Blackwall.  It is in Blackwall & Cubitt Town Ward of Tower Hamlets London Borough Council. Tower Hamlets London Borough Council is the local authority for the London Borough of Tower Hamlets in Greater London, England.  The council is unusual in that its executive function is controlled by a directly elected mayor of Tower Hamlets, currently John Biggs. Sir John Oldcastle (died 14 December 1417) was an English Lollard leader.  Being a friend of Henry V, he long escaped prosecution for heresy.  When convicted, he escaped from the Tower of London and then led a rebellion against the King.  Eventually, he was captured and executed in London.  He formed the basis for William Shakespeare's character John Falstaff, who was originally called John Oldcastle.
Answer: Tower of London