Ockeghem, particularly, was fond of canon, both contrapuntal and mensural.
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Which note value corresponded to the tactus was indicated by the mensural time signature.
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The note derives from the semifusa in mensural notation.
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The whole note derives from the semibrevis of mensural notation, and this is the origin of the British name.
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Another set of signs in mensural notation specified the metric proportions of one section to another, similar to a metric modulation.
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This serves as a counting aid and derives from Baroque notation conventions that were adapted from the old mensural rest system dating from Medieval times.
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In the 20th century, Conlon Nancarrow composed complex tempo or mensural canons, mostly for the player piano as they are extremely difficult to play.
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However, this makes the first definitely identifiable scholar to accept and explain the mensural system to be de Muris, who can be said to have done for it what Garlandia did for the rhythmic modes.