III repealed it in April 1197 after Richard made gifts of land to the archbishop and the diocese of Rouen, including two manors and the prosperous port of Dieppe. Royal expenditure on castles declined from the levels spent under Henry II, attributed to a concentration of resources on Richard's war with the king of France. However, the work at Château Gaillard was some of the most expensive of its time and cost an estimated £15,000 to £20,000 between 1196 and 1198. This was more than double Richard's spending on castles in England, an estimated £7,000. Unprecedented in its speed of construction, the castle was mostly complete in two years, when most construction on such a scale would have taken the best part of a decade. According to William of Newburgh, in May 1198 Richard and the labourers working on the castle were drenched in a "rain of blood". While some of his advisers thought the rain was an evil omen, Richard was undeterred. As no master-mason is mentioned in the otherwise detailed records of the castle's construction, military historian Richard Allen Brown has suggested that Richard himself was the overall architect; this is supported by the interest Richard showed in the work through his frequent presence. In his final years, the castle became Richard's favourite residence, and writs and charters were written at Château Gaillard bearing "" (at the Fair Castle of the Rock). Château Gaillard was ahead of its time, featuring innovations that would be adopted in castle architecture nearly a century later. Allen Brown described Château Gaillard as "one of the finest castles in Europe", and military historian Sir Charles Oman wrote that it was considered "the masterpiece of its time. The reputation of its builder, Cœur de Lion, as a great military engineer might stand firm on this single structure. He was no mere copyist of the models he had seen in the East, but introduced many original details of his own invention into the stronghold". Determined to resist Philip's designs on contested Angevin lands such as the Vexin and Berry, Richard poured all his military expertise and vast resources into the war on the French King. He organised an alliance against Philip, including Baldwin IX of Flanders, Renaud, Count of Boulogne, and his father-in-law, King Sancho VI of Navarre, who raided Philip's lands from the south. Most importantly, he managed to secure the Welf inheritance in