Guarding the Frontier

Aan fitz Flaad & The Marcher Fortress of Oswestry

It began with a question, “How a Breton knight on the Welsh border laid the foundations for the Earls of Arundel and the Kings of Scotland.”

If you stood on the ramparts of Oswestry Castle in Shropshire during the early 12th century, you would be looking directly into the wild, unconquered mountains of Wales.

This was the Marcher Frontier—a dangerous, lawless borderland where Welsh raiding parties clashed constantly with Anglo-Norman knights. To hold a frontier like this, a king couldn't just appoint anyone; he needed a warlord of absolute loyalty, tactical brilliance, and iron nerve.

The man King Henry I chose for the job the Breton knight at the top of our Week 6 Master Chart [Ref: 7100]: Alan fitz Flaad.

The Breton Knight on the Border Alan fitz Flaad originated from Brittany, where his family held the hereditary office of Dapifer (Steward) to the Bishops of Dol. When King Henry I seized the English throne in 1100, he recruited trusted Breton allies to secure his kingdom. Henry granted Alan the strategic Lordship of Oswestry in Shropshire, making him a Lord Marcher. As Lord of Oswestry, Alan held near-regal powers within his domain. He built up the stone fortifications of Oswestry Castle, commanded border garrisons, and waged brutal defensive campaigns against the Welsh princes of Powys. By marrying Avelina de Hesdin, daughter of a massive Domesday landowner, Alan consolidated his power, turning Oswestry into one of the most formidable strongholds on the Western March. The Great Dynasty Split

What makes Alan fitz Flaad’s story truly remarkable isn't just the battles he fought—it is what happened to his sons. From Alan’s hall at Oswestry emerged two distinct branches that would shape British history for 700 years:

1. The English Line (The FitzAlan Earls of Arundel): Alan’s eldest son, William FitzAlan, inherited Oswestry and Clun. Through a strategic marriage to Isabel d'Aubigny, his descendants inherited the grand estate and title of Earl of Arundel. The FitzAlans became one of England's richest and most powerful noble families, commanding armies at Crécy and Agincourt.

2. The Scottish Line (The Royal House of Stewart): Alan’s younger son, Walter FitzAlan, traveled north to Scotland. King David I appointed Walter as the 1st High Steward of Scotland (Dapifer Regis Scotiae). Two centuries later, Walter's descendant married the daughter of King Robert the Bruce, founding the Royal House of Stewart (cross-ref 18196)!

The Legacy of the Marcher Frontier It is astonishing to realize that both the Premier Earls of England (Arundel) and the Royal Stewarts of Scotland—who eventually united the crowns of England, Scotland, and Ireland under King James VI & I—traced their bloodlines back to a single knight guarding a windy timber-and-stone fortress on the Welsh border. Alan fitz Flaad’s legacy reminds us of the true nature of frontier history: great dynasties are born in hardship. It was the discipline, vigilance, and courage forged along the rugged Marcher border that propelled his descendants to the highest thrones in the realm. Want to see the original handwritten 100-year-old manuscript chart for the FitzAlan line?Check out Sunday's Master Chart post