The name is related to, or derived from,
Old Norse Fyrva which meant "to ebb" and it referred to the partially inundated soggy plains that today are dry farmland and the modern town of
Uppsala. In medieval times, a royal estate called
Førisæng, "Fyris meadow", was located near this field. The small lakes
Övre Föret, "the Upper Fyri", and
Nedre Föret, "the Lower Fyri", are remains of this marsh and retain a modern form of
Fyri (the -
t suffix is the definite article, which lake names always take in Swedish). The field went alongside what was renamed the
Fyris river (Fyrisån) in the 17th century to make the connection between the river and the
Sagas more obvious. == Mythology ==