The name Drogheda comes from the Irish Droichead Átha - bridge at the ford. The town sits at the lowest crossing of the River Boyne, where the river bends through the last meadows before reaching the Irish Sea four miles downstream at Mornington. The Norman lord Hugh de Lacy built a motte-and-bailey castle on a south-bank bluff overlooking the crossing some time before 1186; that mound is now Millmount Fort, still the most prominent silhouette in town. Walter de Lacy granted the first town charter to the Meath side of the river in 1194. Soon there were really two towns - Drogheda-in-Meath south of the river, and Drogheda-in-Louth on the north bank - and for centuries they had separate councils, separate seals, and bitter rivalries. They unified in 1412. The oldest stone in town is a section of wall on Rosemary Lane, completed in 1234 as part of the first castle. Most of the medieval walls are gone, but St Laurence's Gate - a two-towered barbican from around 1300 - still spans the eastern entrance to the old town, photographed onto everything from tea-towels to the town coat of arms.

Drogheda was a walled town of the English Pale - the medieval band of English-controlled territory along the east coast - and the Irish Parliament frequently met within its walls. In 1494, the Parliament moved here under Sir Edward Poynings and passed what would become one of the most consequential acts in Irish history. Poynings' Law required that all Irish parliamentary legislation be approved in advance by the English king and his Council. For the next three hundred years, the Irish Parliament could not pass any law without London's prior consent. Until its formal repeal in 1782, Poynings' Law made Irish self-government a fiction. It was signed in this town. Two decades earlier, in 1468, the Earl of Desmond and his two youngest sons - still children - were executed in Drogheda on Valentine's Day on the orders of John Tiptoft, Lord Deputy of Ireland, in a spillover from the English Wars of the Roses. Elizabeth Woodville, the English queen consort, was later implicated in the order. Drogheda's history is full of moments when distant politics turned violent in this small town.

Twelve miles upstream of Drogheda, at Oldbridge, the Battle of the Boyne was fought on 1 July 1690 - a defeat for the Catholic James II and his Jacobite-French army at the hands of his Protestant son-in-law William of Orange. The battle is commemorated on the Boyne valley today by a visitors' centre at Oldbridge House, and the date - Old Style 1 July, New Style 12 July - has been marked by Protestant communities across Ulster every year since. The deeper trauma in Drogheda's memory is older: Saint Oliver Plunkett, Catholic Archbishop of Armagh and the highest-ranking Catholic churchman in Ireland, was hanged, drawn, and quartered at Tyburn in London on 1 July 1681, nine years to the day before the Battle of the Boyne. He had been convicted on the false testimony of the Popish Plot - a fabricated conspiracy that Anglican zealot Titus Oates had concocted out of nothing. Plunkett's head was rescued by friends after his execution, smuggled in pieces back to Ireland, and eventually reassembled. It has been in Drogheda since 1921. He was canonised in 1975. The reliquary is small. The crowd around it is usually quiet.

In September 1979, Pope John Paul II visited Ireland and stopped in Drogheda. He arrived less than a month after the IRA had assassinated Lord Mountbatten on his fishing boat at Mullaghmore in Sligo - one of the most shocking acts of the Troubles. The pope spoke to 300,000 people on the racecourse outside town. He went off-script. On my knees, I beg you, he said, addressing the paramilitaries by name in everything but. I beg you to turn away from the paths of violence and return to the ways of peace. You may claim to seek justice. I too believe in justice and seek justice. But violence only delays the day of justice. Further violence in Ireland will only drag down to ruin the land you claim to love. The IRA campaign did not end that day. It would continue for another nineteen years. But the speech is still remembered in Drogheda as a moment when the world looked at this small port town and listened.

Modern Drogheda is the largest town in the Republic of Ireland - 44,135 people at the 2022 census, technically still classed as a town rather than a city, although its population has long since outgrown that distinction. It is a commuter town for Dublin to the south and Belfast to the north, sitting roughly halfway between them on the M1 motorway. Newgrange, the 5,200-year-old passage tomb that is older than the pyramids of Egypt and a UNESCO World Heritage Site, lies just six miles west on the Boyne. The Boyne Viaduct - a 95-foot-high railway bridge of three iron spans, completed in 1855 - still carries trains over the river. The Highlanes Gallery in the former Franciscan Friary holds the town's municipal art collection. The historic core of West Street has struggled with vacancy and decline; a long-term regeneration plan called Westgate Vision is now underway. Trains still cross the viaduct. The river still runs to the sea. The head of Oliver Plunkett still looks out from behind its glass.