Saint David's day (Welsh: Dydd Gŵyl Dewi) is the feast day of Saint David, the patron saint of Wales, and falls on the 1st of March each year. The first day of March was chosen in remembrance of the death of Saint David. Tradition holds that he died on that day in 589. The date was declared a national day of celebration within Wales in the 18th century.

Cross-party support resulted in the National Assembly for Wales voting unanimously to make St. David's Day a public holiday in 2000. A poll conducted for Saint David's Day in 2006 found that 87% of people in Wales wanted it to be a bank holiday, with 65% prepared to sacrifice a different bank holiday to ensure this. A petition in 2007 to make St. David's Day a bank holiday was rejected by the office of the British Prime Minister, Tony Blair.

St. David (Welsh: Dewi Sant) was born towards the end of the fifth century. He was a scion of the royal house of Ceredigion, and founded a Celtic monastic community at Glyn Rhosyn (The Vale of Roses) on the western headland of Pembrokeshire (Sir Benfro), at the spot where St David's Cathedral stands today. David's fame as a teacher and ascetic spread throughout the Celtic world. His foundation at Glyn Rhosin became an important Christian shrine, and the most important centre in Wales. The date of Dewi Sant's death is recorded as 1 March, but the year is uncertain – possibly 588. As his tearful monks prepared for his death St David uttered these words: 'Brothers be ye constant. The yoke which with single mind ye have taken, bear ye to the end; and whatsoever ye have seen with me and heard, keep and fulfil'.

Coordinates: 51°52′55″N 5°16′08″W / 51.882°N 5.269°W / 51.882; -5.269

St Davids (or St David's, a contraction of St David's and the Cathedral Close,Welsh: Tyddewi), is a city and community in Pembrokeshire, Wales. Lying on the River Alun on St David's Peninsula, it is Britain's smallest city in terms of both size and population, the final resting place of Saint David, the country's patron saint, and the de facto ecclesiastical capital of Wales.

The area was originally known in the Welsh language as Mynyw and in Latin as Menevia, and was later renamed in honour of David. The city is built around St David's Cathedral which was a popular place of pilgrimage in the Middle Ages. Next to it, the 14th century Bishop's Palace is a ruin maintained by Cadw and open to visitors. St David's was once a marcher borough, within which lay the hundred of Dewisland. In 1603 the antiquarian George Owen described it as one of five Pembrokeshire boroughs overseen by a portreeve.

Tradition states that Saint David was born to Saint Non at what is now St Non's, a ten-minute walk south of the city, in about AD 500. It is also said that he was baptised at Porthclais, now the city's port, was brought up by his mother at Llanon, and that he founded the city in around 550. Pope Calixtus II reportedly decreed that two pilgrimages to St David's were equivalent to one to Rome. Because of this a vast income was raised from visiting pilgrims in the Middle Ages. Saint Non's Well overlooks the Pembrokeshire Coast Path and St Brides Bay.

Saint David (c. 500–589) (Welsh: Dewi Sant) was a Welsh Bishop during the 6th century; he was later regarded as a saint and as the patron saint of Wales. David was a native of Wales, and a relatively large amount of information is known about his life. However, his birth date is still uncertain, as suggestions range from 462 to 512. The Annales Cambriae has his death at 601, which would move his birth date forward.

Many of the traditional tales about David are found in the Buchedd Dewi, a hagiography written by Rhygyfarch in the late 11th century. Rhygyfarch claimed it was based on documents found in the cathedral archives. Modern historians are sceptical of some of its claims: one of Rhygyfarch's aims was to establish some independence for the Welsh church, which had refused the Roman rite until the 8th century and now, following the Norman invasion of England in 1066, was to seek a metropolitan status equal to that of Canterbury.

He became renowned as a teacher and preacher, founding monastic settlements and churches in Wales, Dumnonia and Brittany in a period when neighbouring tribal regions (that were to be overrun by Anglo-Saxon or Frankish tribes over the following three hundred years) were still mostly pagan.^{[citation needed]} He rose to a bishopric and presided over two synods as well as going on pilgrimages to Jerusalem (where he was anointed as an archbishop by the Patriarch) and Rome. St David's Cathedral stands on the site of the monastery he founded in the 'Glyn Rhosyn' valley in Pembrokeshire.

David (Hebrew: דָּוִד, דָּוִיד, Modern David Tiberian Dāwîḏ; ISO 259-3 Dawid; Strong's Daveed; beloved; Arabic: داوود‎ or داود‎ Dāwūd) was, according to the Hebrew Bible, the second king of the United Kingdom of Israel and, according to the Gospel of Matthew and the Gospel of Luke, an ancestor of Jesus. David is seen as a major Prophet in Islamic traditions. His life is conventionally dated to c. 1040–970 BC, his reign over Judah c. 1010–1003 BC,^{[citation needed]} and his reign over the United Kingdom of Israel c. 1003–970 BC.^{[citation needed]} The Books of Samuel, 1 Kings, and 1 Chronicles are the only sources of information on David, although the Tel Dan stele records "House of David", which some take as confirmation of the existence in the mid-9th century BC of a Judean royal dynasty called the "House of David".

David is very important to Jewish, Christian and Islamic doctrine and culture. In Judaism, David, or David HaMelekh, is the King of Israel, and the Jewish people. Jewish tradition maintains that a direct descendant of David will be the Messiah. In Islam, he is known as Dawud, considered to be a prophet and the king of a nation. He is depicted as a righteous king, though not without faults, as well as an acclaimed warrior, musician, and poet, traditionally credited for composing many of the psalms contained in the Book of Psalms.

Operation Sea Lion (German: Unternehmen Seelöwe) was Germany's plan to invade the United Kingdom during the Second World War, beginning in 1940. To have had any chance of success, however, the operation would have required air and naval supremacy over the English Channel. With the German defeat in the Battle of Britain, Sea Lion was postponed indefinitely on 17 September 1940 and never carried out.

By early November 1939, Adolf Hitler had decided on forcing a decision in the West by invading Belgium, the Netherlands and France. With the prospect of the Channel ports falling under Kriegsmarine (German Navy) control and attempting to anticipate the obvious next step that might entail, Grand Admiral (Großadmiral) Erich Raeder (head of the Kriegsmarine) instructed his operations officer, Kapitän Hans Jürgen Reinicke, to draw up a document examining "the possibility of troop landings in England should the future progress of the war make the problem arise." Reinicke spent five days on this study and set forth the following prerequisites: