Born on this day 1354 (according to Pennant),

Owain Glyndŵr ,  who led a popular uprising against English rule in the 15th century which lasted more than a decade. 

Owain was a member of the Welsh gentry who studied law at the Inns of Court in London and who was descended from the ancient royal houses of Wales. In 1400, after a century of subjugation to the English crown, the Welsh were ready for rebellion. Henry IV had seized power from Richard II, and the new king refused to support Glyndŵr's legitimate grievance against Reginald de Grey, Lord of Ruthin. This initially local dispute quickly became a national uprising.  Rallying other Welsh nobles, Glyndŵr proclaimed himself Prince of Wales. Support for his cause was widespread, with Welshmen from Oxford and London returning home to join Glyndŵr's rebellion. Henry responded by marching his army into Wales. Glyndŵr remained elusive, harrying Henry's army and ravaging his strongholds. By the end of 1403, Owain Glyndŵr controlled much of Wales. 

Glyndŵr sought to establish alliances, notably with the French. His 'Pennal' letter to Charles VI of France survives today and resulted in some financial and military support. French troops landed at Milford Haven in 1405 but only remained fighting alongside Glyndŵr for under a year.  Owain's defeat at Pwllmelyn in Monmouthshire was a turning point, after which his power ebbed. Glyndwr retreat into the heartland of central Wales, where he died, probably in around 1416, still a free man, having secured a legendary place in Welsh history.  

Born this day 1848 in Saundersfoot,

William Frost,  arguably the true inventor of the flying machine. 

Frost conceived the idea of building a flying machine in the 1890s and despite a lack of funds, constructed the "Frost Airship Glider", which seems to have resembled a vertical takeoff airplane, with gas-filled tanks. Frost reportedly made a flight on or about 2 September 1896. Observers claimed that the machine flew for 500 metres before crashing, outdistancing the Wright brothers in their first powered flight. Unfortunately, Frost's machine was destroyed in a storm the same night, and the flight, though witnessed, was not recorded. Frost applied for a patent which was accepted and registered in London, but he was too poor to pay the renewal fees and the patent lapsed. He died without wealth or recognition in 1935.  

Born this day in 1883  in Gayton, Northamptonshire, England,

Sir Bertram Clough Williams-Ellis , architect, who built the village of Portmeirion between 1925 and 1975.

 The family had strong Welsh roots and Williams-Ellis claimed direct descent from Owain Gwynedd. He is regarded as being a self-taught architect and landscape designer, and was passionate about environmental protection, which led to a knighthood in 1971 for his services ‘to architecture and the environment’. 

He is most closely associated with the construction of the Italianate village of Portmeirion, the setting for the ‘cult’ drama series ‘The Prisoner’ starring Patrick MaGoohan, which was filmed there in 1967. Today the village is a tourist attraction and a lasting tribute to his vision and work.  

Born this day 1968 in Melbourne, Australia (her mother, Carol Ann (nee Jones) was a former dancer from Maesteg, and along with sister Dannii, has always been proud of her Welsh roots)

Kylie Minogue OBE ,  Australian pop singer, songwriter, and actress.

Her role in the television soap series 'Neighbours' brought her recognition, but it was as a pop artist that she became globally popular. She is the only female vocalist to have produced UK chart-topping albums in four consecutive decades (the 80s, 90s, 00s and 10s). 

On 28th May 2010, Llanrwst celebrated the 400th anniversary of the almshouses built by Sir John Wynn.   

They were built in 1610, providing lodgings for 12 almsmen; people who were too poor to afford their own homes, and continued to shelter the needy of the parish until 1976, long after council provision had superseded the role of almshouses. 

The building lay empty for the next 25 years but was restored and opened as a community museum by the Almshouse Museum Trust in 2002, closing in 2011 when the trust's lease expired. It is now used as the headquarters of Llanrwst Town Council.  

On 28th May 1987, the Mametz Wood Memorial, sculpted by David Petersen, was unveiled in Cardiff.  

The First Battle of the Somme was one of the most savage battles of the First World War. The 38th Welsh Division was given the job of attacking Mametz Wood on 7th July 1916 but were driven back by heavy German machine gun fire. They were ordered to attack again and succeeded in reaching the wood. By 12th July, the Germans and their machine guns had been ousted from the woods but more than 4,000 soldiers from the Welsh Division had been killed in the process.  

28th May 1971 saw the opening of the Llanberis Lake Heritage Railway. 

It runs along the trackbed of the defunct Padarn Railway, which was originally built in 1842 to carry slate from the Dinorwic Quarry to Y Felinheli (Port Dinorwic) on the Menai Strait.  

On 28th May 1865 the clipper ship "Mimosa" set sail from Liverpool carrying 153 Welsh emigrants bound for Patagonia. 

The passengers paid £12 per adult and £6 per child for the journey.  Their aim was to establish a Welsh colony in the Chubut River valley in a bid to preserve the Welsh language and culture. They landed on July 28 and were met by Edwyn Cynrig Roberts and Lewis Jones who had arrived in Patagonia in June to prepare for the main cohort of settlers.  They named their landing site Porth Madryn and on September 15th 1865, the first town in the colony was named Rawson, which was followed by settlements at Gaiman and Trelew.

In 1875 the Argentine government granted the Welsh settlers ownership of the land, encouraging  hundreds of others from Wales to join the colony. 

Today, more than 50,000 Patagonians are of Welsh descent, with almost 5,000 being Welsh speakers.  The Welsh-Argentine colony, which became known as Y Wladfa, remains centered around Gaiman, Trelew and Trevelin.