About William Patterson
Lived 1752 – 1835 (aged 82). William Patterson was an American businessperson.
William Patterson (1752–1835) was an Irish-born American businessman, a gun-runner during the American Revolution, and a founder of the Baltimore and Ohio Railroad. His many business dealings included shipping, banking, and the Baltimore Water Company.
Early life and career Patterson was born in 1752 in Fanad, County Donegal, Ireland.
Patterson was reputed to be the second-wealthiest man in Maryland, after Charles Carroll of Carrollton. He was a slave owner who owned several plantations and country estates in the Baltimore area, along with buildings and lots within the city, and branches of his business that reached all the way to the European continent.
Personal life
Patterson was married to Dorcas Spear (1761–1814), a member of the respected Spear-Smith family. Together, they were the parents of thirteen children, including:
Elizabeth Patterson (1785–1879), who married Jérôme Bonaparte, brother of Napoleon Bonaparte. Robert Patterson (1781–1822), who married Marianne Caton, the maternal granddaughter of Carroll, after Robert's death she married Richard Wellesley, 1st Marquess Wellesley, brother of Arthur Wellesley, 1st Duke of Wellington. Edward Patterson (1789–1865), who married Sidney Smith (1794–1879), daughter of Maj. Gen. Samuel Smith. Edward served in the War of 1812 as aide-de-camp to Isaac McKim and was the maternal grandfather of Sidney Turner Swan Dyer (1858–1933) who married Elisha Dyer III, son and grandson of Rhode Island governors, Elisha Dyer Jr. and Elisha Dyer.
Patterson died a millionaire in 1835 in Baltimore. In his will, he freed all of his slaves when each reached the age of 30, and left the majority of his estate to his sons and grandson. He wrote, "The conduct of my daughter Betsey has through life been so disobedient that in no instance has she every consulted my opinions or feelings; indeed, she has caused me more anxiety and trouble than all my other children put together, and her folly and misconduct have occasioned me a train of expense that first and last has cost me much money," and left her only a few properties, all of which totaled approximately $10,000. He left an annual allowance to Nancy Spear predicated upon her agreement to never again attend congressional sessions in Washington, D.C. The will was published in the Baltimore Sun, most likely arranged by Patterson before he died. The will violated the prenuptial agreement Elizabeth Patterson and Jerome Bonaparte signed in 1803, in which Patterson would bequeath a share to Elizabeth that was equal to that of his other children. Although Elizabeth Patterson initially contested the will, she ultimately dropped all legal challenges when she learned that her aunt and trusted confidante Nancy Spear sold Elizabeth's letters to her brothers to be used against her in court and in public opinion.
Patterson was known to be a strict father. He had one illegitimate daughter, to whom he also left part of his estate, as well as to her mother.
Philanthropy and legacy In 1827, Patterson donated the first five acres of land that became Baltimore's Patterson Park. The park, its namesake street (Patterson Park Avenue) and a high school to the east of it are named in his honor.
Patterson's property in Sykesville, known as "Springfield", was inherited for generations before landing in the hands of Frank Brown (former governor of Maryland). Brown sold the property (1,300 acres) to the state of Maryland in 1896. That same year, Springfield State Hospital was created as Maryland's second hospital for the mentally ill. It grew to become the largest institution of its kind on the east coast.
Don’t just read it —
keep it.
Full-length biographies made to live with: read them, listen on the way to work, watch them tonight.
- E-book
- Audio
- Video
Instant download · yours to keep · every purchase keeps this site free
Important facts
People in William Patterson's life
Named in this biography and alive at the same time
Contemporaries
People whose lives overlapped William Patterson's
Frequently asked questions
Who was William Patterson?
American businessperson 1752-1835
When was William Patterson born?
William Patterson was born on 1 November 1752 in County Donegal.
When did William Patterson die?
William Patterson died on 7 February 1835 in Baltimore.
What was William Patterson's occupation?
William Patterson was a businessperson.
What nationality was William Patterson?
William Patterson was American.
Sources & further reading
· Wikipedia: William Patterson
· DBpedia: William Patterson (Maryland businessman)
Cite this page
APA: Biography.guide. (2026). William Patterson. https://biography.guide/william-patterson-businessperson/
MLA: "William Patterson." Biography.guide, https://biography.guide/william-patterson-businessperson/.
Chicago: "William Patterson." Biography.guide. https://biography.guide/william-patterson-businessperson/.
Data last updated: 2026-09-20 · Spot an error? Report a correction.
Page generated 2026-09-27 05:10 UTC