"but it was too short then the day before he left May yes it was May when the infant king of Spain was born Im always like that in the spring Id like a new fellow every year up on the tiptop under the rockgun near OHaras tower I told him it was struck by lightning" (U18.780)

Molly is correct. Alfonso XIII of Spain, seen here as an adult with his wife and new baby, was born May 17th 1886. The birth (and sex of the baby) were anxiously awaited as his father Alfonso XII had died, and the royal couple had 2 daughters. Alfonso XIII was proclaimed King at his birth, and thus never held the Spanish title given to the heir (Infante, or Prince of Asturias). He reigned 1886 - 1931.