The eruption of Mount Vesuvius in 999 AD was reported as “sudden lava fountains and lava emission” (”…piceas atque sulphurea repente flammas erumpere…”), with ashes.

The sources for this activity are:

Damianus Petrus, Opera Omnia, Opusculum XIX.

Ubaldo Monaco, Chronicum Ducum Neapolis, inRaccolta di varie croniche, diarii ecc, appartenenti al Regno di Napoli, Napoli, Perger, 1781.

~~~~~ ~~~~~ ~~~~~ ~~~~~

References;

Complete List of Vesuvian Eruptions

1 – Chronology of Vesuvius’ activity from A.D. 79 to 1631 based on archeomagnetism of lavas and historical sources

2 – Vesuvius Before the 1631 Eruption

~~~~~ ~~~~~ ~~~~~ ~~~~~

~~~~~ ~~~~~ ~~~~~ ~~~~~