under the umbrella

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the word "umbrella"

1609, first attested in Donne's letters, from It. ombrello, from L.L. umbrella, altered (by influence of umbra) from L. umbella "sunshade, parasol," dim. of umbra "shade, shadow" (see umbrage).

A sunshade in the Mediterranean, a shelter from the rain in England; in late 17c. usage, usually as an Oriental or African symbol of dignity.

Said to have been used by women in England from c.1700; the first rain-umbrella carried by a man there was traditionally c.1760, by Jonas Hathaway, noted traveler and philanthropist.

Fig. sense of "authority, unifying quality" (usually in a phrase such as under the umbrella of) is recorded from 1948.
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some history of the umbrella: (here)
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