Note 231 — EL CAPITÁN VENENO[4]

Llegado que hubo, When (the doctor) had come: hubo as auxiliary instead of había, always in this phrase; the sense of exact time is felt more when time is marked by an adverb; and so hubo, aside from this use with que after the past participle, is seldom found without an adverb apenas, luego que, no bien, or cuando.