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To give an idea about how well the calendar was 'nailed down' even quite early, here is the list of dates (and events) from an English liturgical calendar from the 700s (around AD 702). These dates would all have been announced to the townsfolk.

JANUARY

1 Circumcision 
3 St. Genevieve of Paris 
6 Epiphany 
13 St. Hilary 
14 St. Felix of Nola 
17 St. Anthony, Hermit 
18 St. Peter's Chair at Rome and the Assumption of Holy Mary 
20 St. Sebastian
21 St. Agnes (Virgin) 
24 St. Babilas, Bishop and Martyr 
25 Conversion of St. Paul at Damascus 
29 St. Valerius, Bishop, and St. Lucy (Virgin) at Treves

FEBRUARY

1 St. Denis, St. Polycarp and St. Brigid (Virgin) 
2 St. Symeon, Patriarch 
5 St. Agatha 
6 St. Amandus 
16 St. Juliana 
22 The Chair of Peter at Antioch

MARCH

1 Donatus 
7 Perpetua and Felicitas 
12 St. Gregory at Rome 
17 St. Patrick, Bishop in Ireland 
20 St. Cuthbert, Bishop 
21 St. Benedict, Abbot 
25 The Lord was crucified and St. James the brother of Our Lord 
27 The Resurrection of Our Lord

APRIL

4 St. Ambrose 
22 Philip, Apostle

MAY

1 St. Philip, Apostle 
5 The Ascension of the Lord 
7 The Invention of the Holy Cross 
11 Pancratius, Martyr 
14 Earliest date for Pentecost 
31 St. Maximinius at Treves

JUNE

2 Erasmus, Martyr 
8 Barnabas, Apostle 
9 St. Columkill 
22 James the son of Alpheus 
24 Nativity of John the Baptist 
29 Sts. Peter and Paul at Rome

JULY

15 St. James of Nisibis 
26 St. James, Apostle, Brother of John 
26 St. Symeon, Monk in Syria 
29 St. Lupus

AUGUST

1 The Machabees, seven brothers with their mother 
5 St. Oswald, King 
6 St. Syxtus, Bishop 
10 St. Laurence, Deacon 
13 Hippolitus, Martyr 
16 (Sic) [erasure] St. Mary 
25 St. Bartholomew, Apostle 
28 Augustine and Faustinus, Bishops 
29 Martyrdom of St. John the Baptist 
31 St. Paulinus, Bishop at Trier

SEPTEMBER

7 Sergius, Pope at Rome 
9 (Sic) Nativity of St. Mary at Jerusalem 
13 Cornelius and Cyprian 
15 St. Euphemia, Martyr 
19 Januarius. Martyr 
21 Matthew, Apostle 
22 Passion of St. Maurice 
24 Conception of St. John the Baptist 
27 Cosmas and Damian at Jerusalem 
29 St. Michael, Archangel

OCTOBER

1 Remedius and Germanus 
4 Sts. Heuwald and Hewald, Martyrs 
14 Paulinus, Bishop in Canterbury 
18 Luke, Evangelist 
28 Simon and Jude, Apostles 
31 St. Quintinus, Martyr

NOVEMBER

10 St. Leo, Pope 
11 St. Martin, Bishop at Tours 
22 St. Cecilia 
23 Clement at Rome 
24 Crisogonus 
30 St. Andrew, Apostle
DECEMBER

10 St. Eulalia and seventy-five others 
20 St. Ignatius, Bishop and Martyr 
21 St. Thomas, Apostle in India 
25 Nativity of Our Lord Jesus Christ 
26 St. Stephen, Martyr 
27 John, Apostle, and James, his brother 
28 The Innocents 
31 St. Silvester, Bishop

To give an idea about how well the calendar was 'nailed down' even quite early, here is the list of dates (and events) from an English liturgical calendar from the 700s (around AD 702). These dates would all have been announced to the townsfolk.

JANUARY

1 Circumcision 
3 St. Genevieve of Paris 
6 Epiphany 
13 St. Hilary 
14 St. Felix of Nola 
17 St. Anthony, Hermit 
18 St. Peter's Chair at Rome and the Assumption of Holy Mary 
20 St. Sebastian
21 St. Agnes (Virgin) 
24 St. Babilas, Bishop and Martyr 
25 Conversion of St. Paul at Damascus 
29 St. Valerius, Bishop, and St. Lucy (Virgin) at Treves

FEBRUARY

1 St. Denis, St. Polycarp and St. Brigid (Virgin) 
2 St. Symeon, Patriarch 
5 St. Agatha 
6 St. Amandus 
16 St. Juliana 
22 The Chair of Peter at Antioch

MARCH

1 Donatus 
7 Perpetua and Felicitas 
12 St. Gregory at Rome 
17 St. Patrick, Bishop in Ireland 
20 St. Cuthbert, Bishop 
21 St. Benedict, Abbot 
25 The Lord was crucified and St. James the brother of Our Lord 
27 The Resurrection of Our Lord

APRIL

4 St. Ambrose 
22 Philip, Apostle

MAY

1 St. Philip, Apostle 
5 The Ascension of the Lord 
7 The Invention of the Holy Cross 
11 Pancratius, Martyr 
14 Earliest date for Pentecost 
31 St. Maximinius at Treves

JUNE

2 Erasmus, Martyr 
8 Barnabas, Apostle 
9 St. Columkill 
22 James the son of Alpheus 
24 Nativity of John the Baptist 
29 Sts. Peter and Paul at Rome

JULY

15 St. James of Nisibis 
26 St. James, Apostle, Brother of John 
26 St. Symeon, Monk in Syria 
29 St. Lupus

AUGUST

1 The Machabees, seven brothers with their mother 
5 St. Oswald, King 
6 St. Syxtus, Bishop 
10 St. Laurence, Deacon 
13 Hippolitus, Martyr 
16 (Sic) [erasure] St. Mary 
25 St. Bartholomew, Apostle 
28 Augustine and Faustinus, Bishops 
29 Martyrdom of St. John the Baptist 
31 St. Paulinus, Bishop at Trier

SEPTEMBER

7 Sergius, Pope at Rome 
9 (Sic) Nativity of St. Mary at Jerusalem 
13 Cornelius and Cyprian 
15 St. Euphemia, Martyr 
19 Januarius. Martyr 
21 Matthew, Apostle 
22 Passion of St. Maurice 
24 Conception of St. John the Baptist 
27 Cosmas and Damian at Jerusalem 
29 St. Michael, Archangel

OCTOBER

1 Remedius and Germanus 
4 Sts. Heuwald and Hewald, Martyrs 
14 Paulinus, Bishop in Canterbury 
18 Luke, Evangelist 
28 Simon and Jude, Apostles 
31 St. Quintinus, Martyr

NOVEMBER

10 St. Leo, Pope 
11 St. Martin, Bishop at Tours 
22 St. Cecilia 
23 Clement at Rome 
24 Crisogonus 
30 St. Andrew, Apostle
DECEMBER

10 St. Eulalia and seventy-five others 
20 St. Ignatius, Bishop and Martyr 
21 St. Thomas, Apostle in India 
25 Nativity of Our Lord Jesus Christ 
26 St. Stephen, Martyr 
27 John, Apostle, and James, his brother 
28 The Innocents 
31 St. Silvester, Bishop
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The date (under the liturgical year) would be announced at each mass in Catholic areas throughout the medieval era in Europe. So everyone would have a good general idea of dates. There is a nice picture of a liturgical calendar (used by priests in the 1200s) here. The Catholic Encyclopedia has a long article on the history of the Christian calendar.

The date (under the liturgical year) would be announced at each mass in Catholic areas throughout the medieval era in Europe. So everyone would have a good general idea of dates. There is a nice picture of a liturgical calendar (used by priests in the 1200s) here.

The date (under the liturgical year) would be announced at each mass in Catholic areas throughout the medieval era in Europe. So everyone would have a good general idea of dates. There is a nice picture of a liturgical calendar (used by priests in the 1200s) here. The Catholic Encyclopedia has a long article on the history of the Christian calendar.

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source | link

The date (under the liturgical year) would be announced at each mass in Catholic areas throughout the medieval era in Europe. So everyone would have a good general idea of dates. There is a nice picture of a liturgical calendar (used by priests in the 1200s) here.