Fulk III, the Black (c. 970–1040; Old French: Foulque Nerra) was an early Count of Anjou celebrated as one of the first great builders of medieval castles.

With his county seat at Angers, Fulk's bitter enemy was Odo II of Blois, his neighbor 128 km east along the Loire river, at Tours.

"The construction of castles for the purpose of extending a ruler's power was part of Fulk Nerra's strategy," wrote Peter Fraser Purton, in A History of Medieval Siege, c. 450–1220.

[6] she died Jerusalem 1 Apr 1046, and is buried at the Church of the Holy Sepulchre They had two children: Fulk Nerra's first victory was in June 992 at the Battle of Conquereuil, where he managed to defeat Conan I, Duke of Brittany.

Conan's territorial ambitions had been quashed by Geoffroy Grisgonelle in 980, and seven years later, he planned an ambush on Angers while Fulk was attending the crowning of Robert the Pious.

Reinforcements led by Count Herbert Wake-Dog of Maine arrived to help Fulk, routing Odo's surprised men.

The voyage crossed the Alps at the Grand Bernard Pass in present-day Switzerland, then overland to Bari in the southern Italian peninsula (a stop in Rome was usually made) and by ship to the Holy Land.

For his third and fourth trips, Fulk had a moral obligation to protect pilgrims in the years following the desecration of Jerusalem by the "Mad Caliph" Al-Hakim bi-Amr Allah, and provided armed security against robbers, murderers and enslavers along the route.

Since he had no living male children from either of his two marriages, the title to Anjou passed to his nephews, the two sons of his sister Ermengarde-Blanche (m. Geoffroy V of Château-Landon), upon his death.