Edward II (25 April 1284 21 September 1327), also called Edward of Caernarfon, was King of England and Lord of Ireland from 1307 until he was deposed in January 1327. The fourth son of Edward I, Edward became the heir apparent to the throne following the death of his elder brother Alphonso. Beginning in 1300, Edward accompanied his father on campaigns to pacify Scotland. In 1306, he was knighted in a grand ceremony at Westminster Abbey. Following his father's death, Edward succeeded to the throne in 1307. He married Isabella, the daughter of the powerful King Philip IV of France, in 1308, as part of a long-running effort to resolve tensions between the English and French crowns.

Edward had a close and controversial relationship with Piers Gaveston, who had joined his household in 1300. The precise nature of their relationship is uncertain; they may have been friends, lovers, or sworn brothers. Edward's relationship with Gaveston inspired Christopher Marlowe's 1592 play Edward II, along with other plays, films, novels and media. Gaveston's power as Edward's favourite provoked discontent both among the barons and the French royal family, and Edward was forced to exile him. On Gaveston's return, the barons pressured the king into agreeing to wide-ranging reforms, called the Ordinances of 1311.

The newly empowered barons banished Gaveston, to which Edward responded by revoking the reforms and recalling his favourite. Led by Edward's cousin Thomas, 2nd Earl of Lancaster, a group of the barons seized and executed Gaveston in 1312, beginning several years of armed confrontation. English forces were pushed back in Scotland, where Edward was decisively defeated by Robert the Bruce at the Battle of Bannockburn in 1314. Widespread famine followed, and criticism of the king's reign mounted.

The Despenser family, in particular Hugh Despenser the Younger, became close friends and advisers to Edward, but Lancaster and many of the barons seized the Despensers' lands in 1321, and forced the king to exile them. In response, Edward led a short military campaign, capturing and executing Lancaster. Edward and the Despensers strengthened their grip on power, formally revoking the 1311 reforms, executing their enemies and confiscating estates. Unable to make progress in Scotland, Edward finally signed a truce with Bruce.

Opposition to the regime grew, and when Isabella was sent to France to negotiate a peace treaty in 1325, she turned against Edward and refused to return. Instead, she allied herself with the exiled Roger Mortimer, and invaded England with a small army in 1326. Edward's regime collapsed and he fled to Wales, where he was captured in November. The king was forced to relinquish his crown in January 1327 in favour of his 14-year-old son, Edward III, and he died in Berkeley Castle on 21 September, probably murdered on the orders of the new regime.

Edward's contemporaries criticised his performance as king, noting his failures in Scotland and the oppressive regime of his later years, although 19th-century academics later argued that the growth of parliamentary institutions during his reign was a positive development for England over the longer term.

Caernarfon (; Welsh: [kaɨrˈnarvɔn] (listen)) is a royal town, community, and port in Gwynedd, Wales, with a population of 9,852 (with Caeathro). It lies along the A487 road, on the eastern shore of the Menai Strait, opposite the Isle of Anglesey. The city of Bangor is 8.6 miles (13.8 km) to the north-east, while Snowdonia fringes Caernarfon to the east and south-east. Carnarvon and Caernarvon are Anglicised spellings that were superseded in 1926 and 1974 respectively.

Abundant natural resources in and around the Menai Strait enabled human habitation in prehistoric Britain. The Ordovices, a Celtic tribe, lived in the region during the period known as Roman Britain. The Roman fort Segontium was established around AD 80 to subjugate the Ordovices during the Roman conquest of Britain. The Romans occupied the region until the end of Roman rule in Britain in 382, after which Caernarfon became part of the Kingdom of Gwynedd. In the late 11th century, William the Conqueror ordered the construction of a motte-and-bailey castle at Caernarfon as part of the Norman invasion of Wales. He was unsuccessful, and Wales remained independent until around 1283.

In the 13th century, Llywelyn ap Gruffudd, ruler of Gwynedd, refused to pay homage to Edward I of England, prompting the English conquest of Gwynedd. This was followed by the construction of Caernarfon Castle, one of the largest and most imposing fortifications built by the English in Wales. In 1284, the English-style county of Caernarfonshire was established by the Statute of Rhuddlan; the same year, Caernarfon was made a borough, a county and market town, and the seat of English government in north Wales.The ascent of the House of Tudor to the throne of England eased hostilities with the English and resulted in Caernarfon Castle falling into a state of disrepair. The town has flourished, leading to its status as a major tourist centre and seat of Gwynedd Council, with a thriving harbour and marina. Caernarfon has expanded beyond its medieval walls and experienced heavy suburbanisation. The community of Caernarfon's population includes the highest percentage of Welsh-speaking citizens anywhere in Wales. The status of Royal Borough was granted by Queen Elizabeth II in 1963 and amended to Royal Town in 1974. The castle and town walls are part of a World Heritage Site described as the Castles and Town Walls of King Edward in Gwynedd.