The commune is situated 4 miles (6 km) southeast of Abbeville on the D901 and by the banks of the river Somme.
History
The etymology of the name "Eaucourt". One of many towns in Picardie where the name ends in ‘court’. This dates back to the Middle Ages, when a manor was enlarged by the building of smaller houses around it in a ‘court’. ‘Eau’ is ‘water’.
The town of Eaucourt-sur-Somme appears to have been founded in the 7th or 8th century as part of the possessions of the Abbey of St Riquier. By usurpation, or by concession, Eaucourt passed into the hands of the lords of the Ferté, at that time, the Châtillons family.
The castle was first constructed in the 13th century, since the diocesan Pouillé of 1301 talks about the chapel of Saint Margherite and the castle. He called it "Aqua curte".
The castle construction was carried out by the lords of the Ferté in response to the wishes of King Philippe II (Augustus) (1165–1223) to fortify towns in order to defend the newly conquered territory.
Around 1358, during the imprisonment of King John the Good of France, municipal troops of Abbeville demolished the castle to prevent the English any means to establish themselves in the region. Rebuilt soon after, in 1420, by Simon of Boulainvilliers, it was subsequently fought over by the kings of France and England (and the Burgundians) and left in ruins.
The castle was rebuilt in 1436 by John of Eaucourt, who chose to live here. 4 years later it was pillaged by Pierre Renaud of Vignolles in 1440, who put the lord of Eaucourt to ransom.
In 1575, the seigneurie of Eaucourt was held by Françoise of Soyecourt.
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