Nate Sweitzer for BI
In 2019, Leoncio Alonso González de Gregorio y Álvarez de Toledo, the 22nd Duke of Medina Sidonia, stormed into his late mother's palace on the Andalusian coast of Spain.
In a video he posted on YouTube marking the occasion, the Duke, tall and silver-haired, strides triumphantly through the Ambassador Room — a grand hall nearly 33 yards long...