Roy Bean was born in 1825 in Mason County, Kentucky and was the youngest of five, (four sons and a daughter), of Phantly Roy Bean, Sr. and the former Anna Henderson Gore. The family was extremely poor and at age sixteen Bean left home to ride a flatboat to New Orleans hoping to find work. After getting into trouble in New Orleans, Bean fled to San Antonio, Texas to join his older brother Sam. Samuel Gore "Sam" Bean (1819–1903), who had earlier migrated to Independence, Missouri, was a teamster and bullwhacker. He hauled freight to Santa Fe and then on to Chihuahua, Mexico. After Sam fought in the Mexican–American War he moved out of San Antonio where his brother Roy joined him.In 1848 the two brothers opened a trading post in the Mexican state of Chihuahua. Soon after Roy Bean shot and killed a Mexican desperado who had threatened "to kill a gringo." To escape being charged with murder by Mexican authorities Roy and Sam Bean fled west to Sonora, Mexico. By the spring of 1849 Roy Bean had moved to San Diego, California, to live with his older brother Joshua Bean who would be elected the first Mayor of San Diego the following year.