Arnoldus Vanderhorst was born on March 21, 1748, in Christ Church Parish, South Carolina, the son of William Vanderhorst and Elizabeth Raven Vanderhorst. He descended from a Dutch family established in the Lowcountry and grew up among planters and merchants connected to Charleston. His household’s wealth was rooted in land, coastal commerce, and enslaved labor. Vanderhorst received the private education expected of a prosperous planter’s son. He learned reading, writing, arithmetic, riding, plantation management, and the social obligations of parish and county leadership. The Lowcountry environment required familiarity with rivers, tidal lands, rice cultivation, disease, and seasonal movement between plantations and Charleston. As a young adult he acquired property, including interests on Kiawah Island, and became responsible for managing enslaved workforces and agricultural production. He married Elizabeth Raven, strengthening family connections within the region. Plantation administration trained him in accounts, supplies, negotiation, and authority. During the Revolution Vanderhorst supported the Patriot cause and served in the militia. The British occupation and civil conflict in South Carolina tested the loyalties and property of planter families. His wartime service and local standing helped prepare him for later election to the legislature and governorship. Before becoming a prominent politician and namesake of Charleston’s Vanderhorst Street, Arnoldus had been shaped by Dutch-South Carolina ancestry, private schooling, plantation inheritance, marriage, slavery, parish society, and militia responsibility. His public career grew directly from the economic authority of the Lowcountry planter class. Like many revolutionary leaders, he advocated political independence while maintaining a social order based upon racial bondage.