If you are referring to St. Augustine of Hippo, he lived from the year 354 to 430.
No, Saint Augustine did not add months to the calendar year. The calendar we use today has been influenced by various historical figures and events, but the addition of months occurred over a long period of time based on different civilizations' needs and astronomical observations.
In September of the year 386 Augustine experienced his conversion and was baptized soon after by St. Ambrose.
He died of natural causes in the year AD 604.
Construction on the fort began in 1672.
Augustine of Canterbury was sent by Pope Saint Gregory the Great with 40 brother monks, including Saint Lawrence of Canterbury to evangelize the British Isles in the year 597.
Saint Augustine of Canterbury was a monk and abbot of Saint Andrew's abbey in Rome, Italy. He was sent by Pope Saint Gregory the Great with 40 brother monks, including Saint Lawrence of Canterbury, to evangelize the British Isles in the year 597.
There are two well known saints named Augustine and neither had been born, nor their mothers, in the year 300.
Benedictine monks, headed by St. Augustine of Canterbury was sent by the pope to England.
Yes, Monica died in the year 387 and Augustine in 430.
Isidore was born about the year 560 at Cartagena, Spain.
I can find no reliable source that mentions the name of Augustine's concubine. However, a recently released movie on the life of Saint Augustine, Restless Heart, calls her Khalida. I suspect this was an invention of the screen writer so that she had a name in the movie besides "Hey You." After she was abandoned by Augustine, his mother Monica arranged a marriage for him but the future bride, at the time, was not of the legal age to marry. Augustine shortly broke off the engagement and had another fling or two with other concubines before he finally converted to Catholicism and was baptized by Saint Ambrose. He never did marry but some consider his nearly 14 year relationship with 'Khalida' to have been a common law marriage.