History & CultureMental model
Nobody mentioning it almost never proves it did not happen.
A source's silence carries weight only under three conditions: the author meant to be exhaustive, would have noticed the event, and would then have recorded it. The Magna Carta struck contemporaries as unimportant and often went unmentioned. As an inference, silence is at best suggestive and never conclusive.
Useful: Before concluding anything from a gap, check whether something should have been there at all.
Source: en.wikipedia.org