On March 17th of each year, millions mark the traditional feast day of St. Patrick, the patron saint of Ireland. Here’s everything you need to know about past celebrations from the first ever St. Patrick’s Day parade to the history behind the traditional dish of corned beef and cabbage.

WHO WAS SAINT PATRICK? 

St. Patrick, the patron saint of Ireland,  was born Maewyn Succat to a Christian  family in Roman Britain in the late  fourth century AD. Shortly before  he was 16, Patrick was captured by a  group of Irish raiders who took him to  Ireland and forced him into slavery.  Six years later he escaped home to  Britain. Believing he had been called  by God to Christianize Ireland, he later   returned to Ireland as a missionary  of the Catholic Church. He played an  important role in converting the native  Irish to Christianity, travelling around  the country performing baptisms and  confirmations. 

WHEN WAS ST PATRICK’S DAY FIRST  CELEBRATED? 

By the end of the 7th century, St. Patrick  had become a legendary figure and was  venerated as a saint—although he was  never formally canonized. Legends  around St. Patrick, many of which are  still told today, include the story that he  drove the snakes of Ireland into the sea  to their destruction. Natural historians,  however, have suggested that there is no  evidence of snakes having ever existed  in Ireland—as the country was too  cold during the Ice Age for reptiles to  survive. 

It wasn’t until the 1630s that March  17th, the traditional day of St Patrick’s  death, was added to the Catholic  breviary of as the Feast of St. Patrick. By  the late 17th century, Irish people were  celebrating the day by wearing crosses,  ribbons, or shamrocks—the latter which  St. Patrick used to explain the concept  of the Holy Trinity to an ‘unbeliever’ by  showing them the three-leaved plant  with one stalk.

WHY IS ST PATRICK’S DAY LINKED WITH  THE COLOR GREEN AND THE SHAMROCK?

Though green dominates the celebrations  today, it was the color blue—a shade  known as St. Patrick’s blue—that was first  associated with the saint. The earliest  depictions of St. Patrick show him in blue  garments, and the color also appears on  ancient Irish flags. 

In 1541, when King Henry VIII was  declared the first English king of  

Ireland, he used a gold Irish harp on a blue flag for the Irish  coat of arms. The blue shade also appears on the 18th-century  Order of St. Patrick, an order of chivalry created by George  III. As the blue symbols became more associated with English  rule, green grew in popularity as a symbol of rebellion. During  the 1798 Irish Rebellion, the shamrock became a symbol of  nationalism and the ‘wearing of the green’ on lapels became  regular practice. 

WHEN DID THE FIRST ST PATRICK’S DAY PARADE TAKE PLACE?

The first parade has long been believed to be a small celebration  by Irish colonists, held in Boston, Massachusetts, in 1737.  However, in 2018 historian J. Michael Francis of the University  of South Florida found evidence to suggest that, in March of  1601, residents of St. Augustine in Spanish Florida gathered  together and proceeded through the city’s streets in honor of St.  Patrick, who seems to have served as the official ‘protector’ of  the city’s maize fields. 

WHY IS CORNED BEEF, CABBAGE, AND POTATOES THE  TRADITIONAL FARE OF ST PATRICK’S DAY? 

When Abraham Lincoln was inaugurated on March 4, 1861, the  president chose a meal of mock turtle soup, followed by corned  beef and cabbage—a dish traditionally associated with St.  Patrick’s Day feasting. 

Beef was not traditionally an Irish dish; it was under British rule  that the cow came to be farmed for meat. In the era of colonial  rule, beef’s prohibitive cost in Ireland meant that it “became  synonymous with the well-fed British aristocracy and middle  class.” Later, with the invention of ‘corned beef’ in the 17th century, it was Ireland’s substantially lower salt tax—and not the  beef itself—that cemented its reputation as an Irish export. 

As large numbers of settlers moved to America and gained  greater prosperity, beef was back on the menu. Once Irish  Americans popularized St. Patrick’s Day as a celebration,  the corned beef and cabbage of their ancestors became the  traditional fare of the day. 

WHY DOES CHICAGO TURN ITS RIVER GREEN DURING ST  PATRICK’S DAY? AND WHEN DID IT START? 

Chicago has colored its river green to mark the holiday since  1962. In 1961, sanitation workers realized that the green  vegetable dye they used to check for dumped sewage could  double as a St Patrick’s Day decoration—and so a tradition was  born. It reportedly takes 40lbs of dye to achieve the verdant  hue, while the color can last from a few hours to two days. 

WHAT ABOUT ST. PATRICK’S DAY PARADES? 

The first St. Patrick’s Day parade took place in America—not in  Ireland. It took place in New York City on March 17, 1762, and  since that day, cities across the United States have competed for  the biggest and best St. Patrick’s Day celebration. 

The honor of the shortest parade is held by Hot Springs,  Arkansas, where Irish pride is all about staying small. Host of  the “World’s Shortest St Patrick’s Day Parade,” Hot Springs  holds its annual procession on the 98ft-long Bridge Street,  named the “world’s shortest street in everyday use” by Ripley’s  Believe It or Not. In true Irish style, the idea for the parade was  born over a few drinks at a Bridge Street pub in 2003, with the  first marchers taking to the pint-sized street in 2004.