Fortuna Huiusce Diei is the Roman Goddess of fate, Fortuna, in Her aspect as "Fortune of the Present Day", Who has the power to bring good things and good luck right now.
Her temple in Rome was located in the Campus Martius, the "Field of Mars", and though the precise location is still debated, it is most probably the little round temple ("Temple B") in the modern Area Sacra di Largo Argentina in Rome, which when uncovered included some fragments of a female cult-statue. The temple was vowed by the general Lutatius Catulus during the battle of Vercellae, June 30th, 101 BCE, who was obviously happy that the fortune of that day included his survival. He used the spoils of the defeated Celtic tribe, the Cimbri, to build the temple, which was dedicated (officially opened) on a later anniversary of the battle. (Alas, his good fortune did not last: he later chose the wrong side in the civil war and was persuaded to commit suicide.) The fragments of the white marble cult-statue from Temple B include the head of a matronly-looking Goddess, Her hair bound up in a conservative style. She has majestic features (and incidentally, pierced ears), and Her mouth is slightly open.
Fortuna Huiusce Diei likely had a shrine or altar on the Palatine, as there was a street on that hill called the Vicus Huiusce Diei. According to Pliny the Elder, this shrine was supposed to have contained a statue of Athene made by the famous Greek sculptor Phidias, who also made the great chryselephantine (gold and ivory) statue of Athene for the Parthenon in Athens. This statue was dedicated by Aemilius Paulus, who took it as spoils from a battle in Greece, and who died in 160 BCE, which would make this temple to Fortuna Huiusce Diei an earlier and different temple than the one in the Campus Martius.
Her festival was held on the anniversary of Her temple's dedication, June 30th.
Also called: Fortuna Huiusque
Alternate meanings of Her name: "Good Fortune for Today", "Luck of the Day"