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Over a thousand million years ago
Volcanoes erupted forming igneous rocks, the most ancient of these being the Pre-Cambrian rocks that can be found along the St David's peninsula from Stumble Head to Ramsey Island and also at Trefgarn, Johnston, Talbenni, Benton and Roch
About 2.6 million years ago
The earliest known occupation of Pembrokeshire occurred during the later cold stages of the ice age. Neanderthalers or hunters sought shelter in the limestone caves on Caldey Island and at Cathole Quarry.
About 400 million years ago
Caledonian mountain chain reformed giving us the spectacular cliff faces at Pen-yr-aft and Ceibwr. Red sandstone, limestone and carboniferous rocks formed another geological area found in the south of Pembrokeshire. This contained the famous south Pembrokeshire anthracite coal. The Armorican oregano pushed Pembrokeshire further against the north, as a consequence, what are known as the three chimneys formed at the end of Marloes Sands.
10000 to 8000 BC
Early dwellings found in Hoyle's Mouth cave near Penally. Another cave, Wogan cave, can be seen within the walls of Pembroke Castle. The melting ice caps rushing out to sea carved out the Gwaun Valley at Fishguard
About 3000 BC
Britain now cut off from France. Next people to arrive in Pembrokeshire were the Neolithic farmers, arriving by sea. Archaeologists have reconstructed huts used by these people at Clegyr Boia near St David's Cathedral.
About 2000 BC
Arrival of Bronze Age people or Beaker Folk, descendants from the Northern warrior peoples speaking a sort of Indo-European language.
About 1700 to 1650 BC
It was thought that the Beaker people moved the bluestones of Preseli to Wiltshire, creating Stonehenge
About 600 BC
Iron age forts at Castell Henllys and Martin's Haven. It is assumed that Martin's Haven provided a landing stage for the first Celtic settlers
43 AD to 410 AD
Arrival of the Romans. Evidence of a Roman villa found near Wolfscastle by archaeologist Dr Mark Merrony from Tenby
Between 300 and 400 AD
The Irish tribe, the Deisi, under the leadership of Eichaid Almuir, settled in Pembrokeshire. The Ogham writing on stones bears witness to the introduction of Christianity into Pembrokeshire long before it reached the rest of Great Britain. This was also the age of Celtic crosses including the one found at Carew Castle and the one found at Nevern in North Pembrokeshire dated 11th century
About 462 AD
The approximate birth year of St David
St David died on 1st March of this year
Between 844 and 1091 AD
The Vikings raided the coast of Pembrokeshire using Milford Haven as their temporary base
A Viking chieftain called Hubba wintered in the Haven. Hubberston was named after him
The king of West Wales, Hywel Dda and his brother Hywel ab Edwin obtained possession of Deheubarth
The victory of King Harold over the Welsh
The battle of Mynydd Carn, a dynastic struggle for control of the Welsh kingdoms of Gwynedd and Deheubarth
Viking Olaf Haroldston invaded Pembrokeshire. Town names such as Fishguard, Fis Gard meaning fish yard, Goodwick, Gud-vik, meaning a fine harbour and Caldey, Caldy, the cold island are from Norse derivation.
Death of Rhys ap Tewdwr triggered the most important event in the history of Pembrokeshire. Welsh tribes of Deheubarth were overcome by the advancing Norman armies.
Between 1108 and 1156 AD
Flemish refugees settle in South Pembrokeshire where they worked as farmers
The Order of the Templars founded. It is reputed that the Knights Templar had a religious house in Templeton.
Wizo granted all the churches in his barony to the Benedictine abbey at Gloucester, which included a church at Slebech. Wizo's seat was at Wiston Castle.
St David was canonised at the request of Henry I by Pope Caixtus II
Gilbert de Clare became Earl of Pembroke
Giraldus Cambrensis (Gerald of Wales) born at Manorbier castle
St David's cathedral built
Between 1189 and 1245 AD
Pembroke Castle built by William Marshall and his five sons
Haverfordwest Priory founded by Robert Fitz Richard
The Earl of Pembroke received annual rent of 16s 4d for a 'seam of sea-cole at Coadrath'
Henry de Gower became bishop of St David's
Before 1382 AD
The earliest known Welsh manuscript written. This contains the stories of the Mabinogion and portrays the mythological lives of the old Celts.
Henry Tudor born at Pembroke Castle
Pembroke Castle besieged by an army of Welshmen led by Sir Rhys ap Thomas' brother
Jasper Tudor, the Earl of Pembrokeshire helped Tenby inhabitants rebuild and strengthen the walls of the town against the coming of the Spanish Armarda
Henry Tudor sets foot on Welsh soil at Mill Bay, near Dale on Sunday 7th August with the banner bearing the red dragon of the ancient hero Cadwaladr.
Robert Recorde, the famous mathematician, was born in Tenby. Pioneer of the (=) sign
Henry VIII gifted Pembroke castle to Anne Boleyn creating her marchioness of Pembroke castle
George Owen, the Welsh Antiquarian, author and naturalist was born in Henllys
Another repair of the town walls in Tenby. Howell Howell, who was mayor at the time, has his initials on a plaque on the town walls, opposite the old Ford Garage (now a car park)
The Quakers established in Haverfordwest
Barti Ddu (Black Bart) born in Little Newcastle, the son of a poor farmer
Royalist, Earl Carbery of Carmarthenshire, attempted to break Pembroke's hold but was driven back by Colonel Rowland Laugharne
Oliver Cromwell left London on 3rd May with the aim of destroying Pembroke Castle
An outbreak of plaque hits Haverfordwest, over 300 residents died
First Baptist church in Wales established in Rhydwilym
The Ford (old bridge) at Haverfordwest was gifted to the town by Sir John Phillips of Picton Castle
Pembrokeshire historian, Richard Fenton born at Rhosson, St David's
General Sir Thomas Picton born in a town house in Hill Street, Haverfordwest
The Mabinogian translated into English by the Reverend John Jones so that non-Welsh speaking people could enjoy the book. Arberth (Narberth) is the first place mentioned and tells the tale of Pwyll, Prince of Dyfed
Cosheston was an important area for ship building.
Admiral Lord Nelson visited Milford Haven
Harbour built at Saundersfoot
The start of the Rebecca Riots
Arrival of the first special excursion train operated by the South Wales Railway Company in Haverfordwest
First passenger railway in Haverfordwest
Steamship service commenced from Neyland to take passengers to Ireland, Portugal and Brazil
Over 30,000 tons of coal a year was being exported from Saundersfoot
The Tenby town corporation were to pull down the arches at the South West Gate until Dr George Chater applied to the Court of Chancery for an injunction to prevent their destruction.
First trading vessel to enter Milford Haven was the steam trawler Sybil on 27th September
Pembroke Dock became the home of the famous Sunderland flying boats after the Royal Air Force established a base here
Bird sanctuary established at Skokholm
Pembrokeshire coastline first designated as a National Park
Approval and building of the first oil refinery, Esso, near the village of Herbrandston
Opening of the Cleddau Bridge
Sea Empress oil spillage disaster on 15th February. Tanker ran aground just off the rocks at St Anne's Head