490 BC Traditional date of the Battle of Marathon, where a small Athenian force defeats the Persian Empire.
1217 Prince Louis of France and King Henry III of England sign the Treaty of Lambeth, ending the First Barons' War.
1639 King Charles I recalls Thomas Wentworth, Lord Deputy of Ireland, to England, where he becomes the king's chief adviser and is soon created Earl of Strafford.
1792 Court-martial begins for instigators of the mutiny on the Bounty on board HMS Duke in Portsmouth Harbour, presided over by Vice-Admiral Samuel Hood.
The Newport Transporter Bridge was opened on September 12th, 1906. It is one of only six (seven?)such bridges in the world still operating( currently undergoing major repairs). A transporter bridge is in effect, a suspended ferry operated by a high-level boom, which is suspended from towers at each end.
By 1900, Newport's industry had expanded on the east side of the river Usk, but the population was largely based on the west side. The transporter bridge was seen as the most economical way of carrying the workforce, to their place of work, as a conventional ferry had proved not to be practical, due to the extreme tides and a conventional bridge would have needed a long approach ramp in order to gain enough height to allow tall ships to pass under.
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1919 Adolf Hitler joins the obscure German Workers' Party as its seventh member, agreeing not with workers' rights but with its German nationalism and antisemitism
1970 Supersonic airliner Concorde lands for the first time at Heathrow airport.
On its completion on 12th September 2008, The Tower, Meridian Quay in Swansea, became the tallest building in Wales at 107m (351ft).
The tower, which has 29 storeys, houses mainly residential apartments, with a restaurant on the top three floors. It is reported that a penthouse apartment on the 26th floor was sold for £1 million.
12 Sep 1967 Filming continued for The Beatles Magical Mystery Tour. The bus headed for Widecombe on the Moor, where a local fair was being held but the bus driver (Alf Manders) took a shortcut to bypass heavy traffic and ended up stuck on a bridge, the coach ended up having to drive in reverse for a half-mile before it could turn around. They then head for Plymouth, followed by a 20-car convoy of journalists and photographers.
12 Sep 1966 N.B.C. aired the first episode of The Monkees TV show in the US. The series which ran for a total of 58 episodes, followed the adventures of four young men (The Monkees) trying to make a name for themselves as a rock 'n roll band. The show introduced several innovative new-wave film techniques to series television and won two Emmy Awards in 1967, including Outstanding Comedy Series.