Although the St. Clair County Sheriff's Department has always considered William Biggs to be the first Sheriff that may not be accurate.
In 2008 The Belleville News Democrat ran an article claiming That Thomas Brady was the first Sheriff.
An excerpt from a Belleville News Democrat article describing Thomas Brady, our first Sheriff.
Wednesday, Nov. 12, 2008
Belleville's history forever tied to America's military
"While many patriots retired to the area, a few were here before the Revolution.
Thomas Brady lived in Cahokia before the war. He mustered a group of fighting men from Cahokia and Prairie du Pont that in 1777 marched to St. Joseph, Mich., to free an enemy-held garrison, according to local historians."
Brady and Biggs were both members of George Rogers Clark's company and settlers in the Bellefontaine (Waterloo)/Cahokia area. St. Clair County was declared a "County" in 1790.
THOMAS BRADY was a resident of Cahokia before the Revolution. Learning of the struggle of the colonies, he raised a small company of men in 1777 and marched to St. Joseph, Michigan. They captured the garrison, but returning, they were overtaken at Calumet and in a skirmish which ensued, two were killed and Brady was taken prisoner. The following year he escaped and finally reached Cahokia. He served under Col. Clark and was elected sheriff of St. Clair County. He died in Cahokia.
MRS. THOMAS BRADY was better known as Madam La Compt. She was born of French parents in 1734, at St. Joseph, Michigan. She removed to Cahokia, Illinois, in 1770. She rendered distinct service to the Americans by preventing Indian outbreaks during the Revolutionary War. After the death of Mr. Brady she took the name of her second husband, La Compt. She died in 1843 in Cahokia, aged 109 years.
Among the early immigrants was the famous Mrs. La Compt, who came to Cahokia about the year 1770. She was of French birth, the family name being La Flamme. She was born at St. Joseph, on Lake Michigan, in 1734. She was a widow when she married M. La Compt of Cahokia, from which marriage proceeded one of the largest French families in the state. She was a great at favorite among the friendly Indians, and through their aid and information, she succeeded in saving the early settlers from many a bloody massacre at the hands of the hostile savages. After the death of her second husband, La Compt, she married the celebrated Thomas Brady, who was also a citizen of Cahokia. She outlived Brady, and died in Cahokia in 1843, at the advanced age of one hundred and nine years. Thomas Brady, third husband of Mrs. La Compt, was a native of Pennsylvania, and came to Cahokia in a very early day. He was a brave and daring man, as many of his exploits in history attest. He was among the first to offer his services in the war of the Revolution. As early as 1777 he raised a small company of men from the villages of Cahokia and Prairie du Pont, marched through the wilderness to the fort at St. Joseph, Michigan, then called the Cow Pens, and captured the fort with the loss of but one man. After the organization of St. Clair county by Gov. St. Clair, in 1790, known as a part of the Northwest Territory, he was appointed the first sheriff of the county. He died in Cahokia several years afterward, lamented by many warm friends.