William White's Notes and Queries (1854)

"In one of the bodegas or cellars belonging to the firm of M. P. Domecq, at Xeres, are to be seen five or six casks of immense size and antiquity (some of them, it is said, exceeding a century). Each of them bears the name of some distinguished hero of the age in which it was produced, Wellington and Napoleon figuring conspicuously amongst others: the former is preserved exclusively for the taste of Englishmen."

From Notes and Queries by William White, published by Oxford University Press, 1854; picture of the Domecq casks which still exist in Bodega El Molino, Jerez de la Frontera, courtesy of sherry.org