(FORTUNE Magazine) – In the past, royals married only royals. Consequently, almost all the surviving European monarchs are related to one another, most through the lineage of Queen Victoria and her nine children. Compared with the Windsors, though, the other princes of Europe are paupers: -- Beatrix Wilhelmina Armgard of the Netherlands, 53. Only $550,000 of a total budget of $3.3 million is at her personal discretion. The rest covers her staff of 300, the maintenance of her residence at The Hague, a small castle used as a weekend retreat, and a farm in northern Italy. Her fortune, | estimated at $4.4 billion, reportedly includes 5% of Royal Dutch/Shell. -- Badouin of Belgium, 60. Three-quarters of his $6 million budget is spent on a staff of 150 that ranges from gardeners to diplomatic advisers. Another 12% covers the heating and maintenance of two castles, one in central Brussels, the other in Laeken. -- Juan Carlos I of Spain, 53. The annual royal budget is some $8.6 million and includes the Civil List used primarily for the personal expenses of the royal family, most of it for travel and entertainment. The state picks up palace costs and all those associated with official visits. General Franco overturned the monarchy in a civil war, then restored it by naming Juan Carlos his heir in 1969. -- Carl XVI Gustaf of Sweden, 44. Of $8.3 million granted annually, some $3.2 million is at the King's discretion to cover his staff and travel expenses. The rest pays for eight palaces, one of which is used as an official residence. King Gustaf is married to a commoner, Queen Sylvia, who is half German, half Brazilian. They live on the outskirts of Stockholm and send their kids to public schools.

-- Harald V of Norway, 54. The total 1991 budget of $7.9 million includes the $1.7 million King Olav received prior to his death in January to cover his personal expenses and $425,000 for costs associated with running the palaces. His son, now King Harald, received an additional $1.6 million. -- Margrethe II of Denmark, 50. She gets a $5.6 million annual ''appanage,'' or allowance. Two-thirds is spent on salaries; the rest covers travel expenses and the heating and maintenance of her three castles. The Queen illustrates books, translates literature into Danish, has designed a Christmas seal, and has produced the stage sets for ballets at the Danish national theater.