Other royal guests included Prince Pavlos of Greece and Princess Marie-Chantal, Queen Sofia of Spain, Prince Felipe and Princess Letizia of Spain.

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Earlier on Saturday the Pope was welcomed at the airport by King Juan Carlos and Queen Sofia, and cheered by hundreds of ordinary Spaniards.

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From an office inside the Queen Sofia Spanish Institute on Park Avenue, Ms. Deitz and three employees (longstanding loyalists who are often joined by paid interns) do everything in-house, including the taxes.

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"Queen Sofia has canceled her visit to the UK for the Jubilee celebrations following the advice from the Spanish government that the visit would be inappropriate in the current circumstances regarding Gibraltar, " a spokesman for the Spanish Royal Household said.

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That thoughtfulness is in evidence not just through their patronage of the arts (he is chairman of the Queen Sofia Spanish Institute and serves on the board at the Metropolitan Opera and at Carnegie Hall, and she is a trustee at the Metropolitan Museum of Art), but also in their generosity with their friends.

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