St. Patrick is Ireland's leading patron saint. Although he wasn't the first Christian missionary in Ireland, he is credited with bringing Christianity to the island.

St. Patrick has a cool symbol: The shamrock.

St. Patrick is known for  driving snakes out of Ireland.

There weren't any snakes in Ireland but Patrick drove them out anyway.

St. Patrick is the official sponsor of an awesome drinking holiday. Not an endorsement for this or any other beverage.

Today St. Patrick's Day, the anniversary of his passing, is celebrated worldwide.

St. Brigid is Ireland's female patron saint. She's as big a deal as St. Patrick.

St. Brigid also has a cool symbol: Brigid's cross.

St. Brigid is the patron saint of a great many things.

Among the things St. Brigid is patron saint of:
babies, 
blacksmiths,
blacksmithing,
boatmen,
cattle farmers,
children whose parents are not married,
children whose mothers are mistreated by the children's fathers,
Clan Douglas,
dairymaids,
dairy workers,
dairy production,
fugitives,
healing,
Ireland,
learning,
Leinster,
livestock,
mariners, 
midwives, 
milkmaids,
nuns,
poets,
poetry,
the poor,
poultry,
poultry farmers,
poultry
raisers,
printing presses,
protection,
sailors,
scholars,
travelers,
and watermen.

She is also one of several patron saints of beer.
https://vinepair.com/articles/patron-saint-of-beer/

St. Brigid even turned water into b*er. (Sorry about the  *. You can't say this word in a description of YouTube doesn't like it.)
That's right. She's a patron saint of b*er.

Sadly, Brigid does not have an awesome drinking holiday associated with her.

St. Columba is Ireland's third patron saint.

He was such a badass saint he could baptize an entire tribe of Picts with one hand.

St. Columba came to Ireland from Scotland.

Columba could predict when people would die, which made him popular.

Despite the obvious handicap of being Scottish, Columba became one of the 12 apostles of Ireland.

Columba left behind this church in Donegal.
But he lacks both a cool symbol and an awesome drinking  holiday.

Thank you for watching!
Image credits:
Shamrock: According to legend, Saint Patrick used the three-leaved shamrock to explain the Holy Trinity to Irish pagans. – Creative Commons via Wikipedia
https://en.wikipedia.org/wiki/Shamrock#/media/File:Irish_clover.jpg
https://upload.wikimedia.org/wikipedia/commons/0/0c/Irish_clover.jpg

Pint of Guinness – Public Domaine pictures
https://www.publicdomainpictures.net/pictures/20000/velka/pint-of-proper-guiness-in-dublin.jpg

St. Columba’s church - West wall of St Columba's church, Gartan, Donegal; Gartan is said to be the birthplace of Columba, Kay Atherton, Creative Commons via Wkipedia
https://upload.wikimedia.org/wikipedia/commons/3/3e/St_Columba%27s_church%2C_Gartan%2C_Donegal.jpg

St. Patrick postcard - : "St. Patrick's Day Souvenir" postmarked 1912 in the United States. On postcard: "OLD WEIR BRIDGE" Description: "1912 POSTCARD ST. PATRICK'S DAY SOUVENIR; POSTALLY USED and CANCELLED MARCH 1912" Pictured: The painting depicted is of the "Old Weir Bridge" located Dinis Cottage, in Killarney National Park, Ireland. Public Doman via Wikimedia Commons 
https://upload.wikimedia.org/wikipedia/commons/2/20/PostcardStPatricksDaySouvinir1912.jpg

Patrick depicted with shamrock in detail of stained glass window in St. Benin's Church, Kilbennan, County Galway, Ireland, Andreas F. Borchert, Creative Commons via Wikipedia

St. Finnian imparting his blessing to the Twelve Apostles of Ireland. 
Clonard, County Meath, Ireland Detail of the seventh stained glass window in a series depicting the life of St. Finian in the Church of St. Finian at Clonard. The windows were created by Hogan in 1957. The inscription reads: Saint Finian imparts his blessing to twelve apostles of Ireland. This image has been cropped from this image. Andreas F. Borchert, Creative Commons via Wikipedia.

https://commons.wikimedia.org/wiki/File:Saint_Columba_converting_the_Picts.jpg Saint Columba converting King Brude of the Picts to Christianity, Mural painting in the Scottish National Portrait Gallery, photographed by uploader, Kim Traynor. Creative Commons via Wikimedia Commons

https://en.wikipedia.org/wiki/Hiberno-Scottish_mission#/media/File:Columbanus_at_Bobbio.jpg
Fresco of Saint Columbanus in Brugnato Cathedral, Fresco of Saint Columbanus on a column at Brugnato Cathedral in Italy, Davide Papalini, Creative Common via Wikipedia.

https://www.wikigallery.org/wiki/painting_130889/Lorenzo-Lotto/Blessings-of-St-Bridget-(detail)-1524
"Blessings of St Bridget (detail) 1524" oil on Canvas. Lorenzo Lotto. Public domain via Wikigallery.