"Seeking the Truth about Chronology Today"
The activity in 1150 AD was reportedly violent strombolian activity.
The source for information on this activity is:
El Eldrisi, L’italia descritta nel libro del Re Ruggero, quoted in Baratta, Il Vesuvio e le sue eruzioni, Roma, Dante Alighieri, 1897.
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References;
Complete List of Vesuvian Eruptions
1 – Mount Vesuvius: 2000 years of volcanological observations
2 – Vesuvius Before the 1631 Eruption
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