- 300 million years ago – Brymbo Fossil Forest
- 250,000 years ago – Pont Newydd Cave, Cefn Meiriadog
- Bronze age – Mold Gold Cape
- Iron Age – Penycloddiau hillfort
- 120 to 150 AD – Roman Baths, Prestatyn
- 600s AD Age of the Saints – St Winefride, Holywell
- 757 to 796 AD – Offa’s Dyke
- 1131 AD – Basingwerk Abbey
- 1260s AD – Dinas Bran – built by Princes of Powys
- 1277 AD – Flint Castle – built by Edward 1
- 1320 AD – Effigy of Gruffydd ap Llywelyn ab Ynyr of Ial – Welsh soldier
- 1345 AD Llangollen Bridge
- 1400 to 1410 AD – Owain Glyndŵr led War of Independence
- 1435 AD – Nantclwyd y Dre, Ruthin – oldest timber town house in Wales
- 1568 AD – Caerwys Eisteddfod Harp and Commission
- 1568 AD – Humphrey Llwyd Memorial- cartographer
- 1588 AD – Translation of Bible into Welsh
- 1595 AD – Rise of the landed gentry – Chirk Castle
- 1737 AD – Canalisation of River Dee
- 1760 to 1942 AD – Hayes Pottery, Buckley
- 1770s AD – Industrial Age begins – Bersham Ironworks
- 1780s AD – Ladies of Llangollen
- 1800s AD – early 1900s shipbuilding on the Dee (Lizzie May built 1900)
- 1805 AD Pontcysyllte aqueduct and canal completed
- 1813 to 2001 AD – Gee Printers, Denbigh
- 1848 to 1995 AD – North Wales Hospital
- 1860s to 1996 AD – Coal mining – Bersham Colliery in 1960s
- 1863 AD – Bethesda Chapel , Mold – where writer Daniel Owen worshipped
- 1864 AD – Wrexham Football Club founded – one of the oldest clubs in Wales
- 1870s AD – Development of seaside resorts – Rhyl and Prestatyn
- 1870s AD – Halkyn Lead Mine
- 1876 AD – Wrexham Exhibition of art & industry
- 1880s AD – Tithe Wars – auction at Pentreffynnon Farm
- 1880s AD – Breweries – Wrexham Lager
- 1888 Train at Mount Pleasant Colliery Buckley
- 1897 AD Jubilee Bridge, Queensferry
- 1940s AD – Storage of warfare chemicals at Rhydymwyn
- 1947 AD – Llangollen Eisteddfod founded
With thanks to the following for use of images on this website: Brymbo Fossil Forest (Brymbo Heritage Project), Pont Newydd Cave, Cefn Meriadog (Cefn Meriadog Historical Society), Penycloddiau Hillfort (© Crown copyright: RCAHMW), Roman Baths Prestatyn (Heather Williams), Saint Winefride’s Holywell (Lorna Jenner), Basingwerk Abbey (Jo Danson), Dinas Bran (Carl Rogers), Flint Castle (Vicky Perfect), Owain Glyndwr (Colin Spofforth), Nantclwyd y Dre (Cyfeillion Nantclwyd y Dre Friends), Caerwys Eisteddfod Harp (© Mostyn Estates Ltd.), Humphrey Llwyd (Shaun Evans), Translation of Bible into Welsh (Heather Williams), Chirk Castle (Heather Williams), Bersham Ironworks (Wrexham Museum Service), Hayes Pottery (Ivor Lewis), Ladies of Llangollen (Heather Williams), Connah’s Quay Shipbuilding (Steve Clarke), Pontcysyllte Aqueduct (Heather Williams), Bethesda Chapel Mold (Tony Trasmundi), Bersham Colliery (North Wales Miners Association), Halkyn Lead Mine (Flintshire Record Office), Tithe Wars Pentreffynon (Graphic Newspaper), Warfare Chemicals Rhydymwyn (Heather Williams), Llangollen Eisteddfod (Heather Williams), St Giles Steeple Wrexham (Wrexham Museum Service), Wrexham Lager Brewery (Wrexham Museum Service), Wrexham A.F.C black and white (Wrexham Museum Service), Shotton Steelworks (Coral Hansom), North Wales Express (Glyn Jones), Daniel Owen (Flintshire Record Office).