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The Vatican said the sheika met with Pope Francis for 30 minutes, informing him of "the grave situation of schools in the various areas of conflict."

As to the guiding principle behind the buying, art experts say the sheika is simply trying to amass the best of the best, whatever the price.

The sheika does not have a formal background in art history, having studied political science and literature at Duke University in North Carolina.

In an interview that year with The New York Times, the sheika suggested that establishing art institutions might challenge Western preconceptions about Muslim societies.

“The sheika has a very grand vision and is a very educated woman,” said Leila Heller, whose New York gallery represents many Middle Eastern artists.