The caption under this photo reads, “This quartette of happy-looking children includes Crown Prince Alfonso, Princess Marie Cristina, Princess Beatrice, and Prince Jaime, sons and daughters of King Alfonso of Spain. They are seen in that order from right to left. The little car in which they are having such a good time is a real automobile and can run swiftly. The royal children use it every pleasant day in the stately park surrounding the palace at Madrid.”

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photo from Rider and Driver, 11 July 1914