I know "various medieval nobles" is vague but i would just like to know as much as i can.
I would prefer later periods (14th/15th centuries), preferably english or western european nobles.
I of coure know that there would be plenty of variation due to differances in population, teritory, income, prosperity... but would still like to know.
Data from Spain, extracted from Fernández de Oviedo, Batallas y Quinquágenas:
Alonso de Cárdenas, master of the Order of Santiago. 80,000 ducats per year. 15,000 vassals.
Duke of Infantado. 60,000 ducats per year. 30,000 vassals.
Duke of Medinaceli. 35,000-40,000 ducats per year. More than 8,000 vassals.
Duke of Sessa, 20,000 ducats per year. More than 6,000 vassals.
Duke of Luna, 20,000 ducats per year. Some 8,000 vassals.
Marquess of Astorga, 25,000-30,000 ducats. Around 12,000 vassals.
Count of Tendilla, 20,000 ducats. About 10,000 vassals.
Marquess of Aguilar, 20,000 ducats, about 2,000 vassals.
Admiral of Castile, 50,000 ducats, 8,000 vassals.
Duke of Cardona, 25,000 ducats, 5,000 vassals.
Marquess of Denia, 14,000-18,000 ducats, around 3,500 vassals.
Count of Cocentaina, 2,000 ducats, some 1,000 vassals.
Admiral of Valencia, 13,000 ducats, about 6,000 vassals.
I think this list should be representative enough.
Would you like some information on Spanish nobles from the late XV century and early XVI century?
I happen to have the Batallas y Quinquágenas on hand, where Fernández de Oviedo details the genealogies of every important family in the year 1550, including the fiefdoms and how much income they have.
Off the top of my head I can tell you that there were massive variations depending on the fiefdoms. The duke of Infantado was making in 1550 some 60,000 ducats per year, while Cardona was making not even half that, and Coloma was on the ballpark of 12,000 ducats.