According to historian Golo Mann, Windthorst was one of the greatest of German parliamentary leaders: no one equaled him in his readiness as a debater—his defective eyesight compelling him to depend entirely upon his memory. It was his misfortune that nearly all his life was spent in opposition, and he had no opportunity of showing his abilities as an administrator. He enjoyed unbounded popularity and confidence among the German Catholics, but he was in no way an ecclesiastic: he was at first opposed to the Vatican decrees of 1870, but quickly accepted them after they had been proclaimed. He was a very agreeable companion and a thorough man of the world, singularly free from arrogance and pomposity—owing to his small stature, he was often known as "die kleine Excellenz".