Lucius is a slur used to describe Blacks in a derogatory way. Commonly used on poor black people. During the period prior to the Civil War, many blacks were named after famous Romans (e.g. Lucius, Marcus, Scipio, etc.)
The word Lucius is a racial slur that has been used historically to degrade and dehumanize blacks. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to blacks. If you are unsure about whether or not it is appropriate to use the word Lucius, it is best to err on the side of caution and avoid using it in any situation.