With apologies for the pun, the Fifteenth Court of Appeals faces an “unprecedented” situation.  Unlike the other intermediate courts of appeal in Texas, the newly created Fifteenth Court of Appeals has no immediate predecessor.  The Legislature gave it statewide jurisdiction over specific kinds of cases, as opposed to general jurisdiction over cases from a particular geographic area. As a result, that court does not start with an “inherited” body of precedent.  The Fifteenth Court thus faces a novel—and fundamental—question: what is its precedent?   This episode examines five sources of insight for answering that question: (1) English common law (as defined by a Texas statute dating back to the Republic); (2) “vertical” precedent, as described by a 2022 supreme court case; (3) federal practice about the Erie doctrine; (4) generally recognized conflicts-of-laws principles; and (5) historical examples from the 1840s, when the Supreme Court of the Republic of Texas confronted a similar problem with a lack of precedent.