The New Testament gives Jesus two genealogies. They agree on the largest claim: Jesus belongs to the line of David. Once they pass David, however, the lists split. Matthew follows David’s son Solomon. Luke follows David’s son Nathan. Near the end, Matthew calls Joseph the son of Jacob, while Luke calls him the son of Heli.
These are not spelling variations in an otherwise identical record. They are different lines with different names, structures, directions, and endpoints. Christian interpreters noticed the problem long before modern biblical criticism, and several proposed solutions remain popular. None is stated directly in either Gospel.
What the two texts actually say
Matthew 1:1-17 KJV begins with Abraham and moves forward through David, Solomon, the kings of Judah, the Babylonian exile, and Joseph. Its final link says, “Jacob begat Joseph the husband of Mary, of whom was born Jesus, who is called Christ” (Matthew 1:16 KJV). Matthew then arranges the history into three groups of fourteen generations.
Luke 3:23-38 KJV appears after Jesus’s baptism and moves backward. Jesus is described as “being (as was supposed) the son of Joseph, which was the son of Heli” (Luke 3:23 KJV). The line runs through Nathan rather than Solomon, continues past Abraham, and ends with Adam and God.
The contrast begins with purpose. Matthew opens his Gospel by naming Jesus “the son of David, the son of Abraham” (Matthew 1:1 KJV). His structure highlights Israel’s patriarch, its monarchy, its exile, and the arrival of the Messiah. Luke places the genealogy after the heavenly voice calls Jesus God’s Son, then extends the line to Adam. One genealogy concentrates Israel’s history. The other places Jesus within humanity’s story.
That literary shaping does not by itself prove that every name was invented. It does show that the lists were written to interpret Jesus, not merely to preserve neutral family data. Historical and theological aims can overlap, but they should not be confused.
Was Luke tracing Mary instead?
A common harmonization says Matthew records Joseph’s ancestry and Luke records Mary’s. That would explain why the lines differ while allowing both to connect Jesus to David.
The difficulty is that Luke never says this. Mary is not named in the genealogy, and the text moves from Jesus to Joseph and Heli. A 2025 defense of the Marian reading argues that Joseph can be treated as a parenthetical reference and Heli as Mary’s father, making Joseph his son-in-law. The same article acknowledges that no surviving genealogy of Mary verifies the proposal and that Luke does not explicitly identify the list as hers.
The proposal is also later than many readers assume. E. L. Abel’s study in New Testament Studies notes that a clear Joseph-versus-Mary harmonization was advanced around 1490. Abel argues against it because Luke names Joseph and because maternal ancestry was not the usual form of Jewish genealogical record.
Could Joseph have had a legal father and a biological father?
An older explanation appears in Eusebius’s fourth-century Church History, where he preserves an argument attributed to the earlier Christian writer Julius Africanus. Africanus’s account says one Gospel follows natural descent and the other legal descent. Through levirate marriage, a man could father a child who was legally counted as the heir of a deceased relative. On this reconstruction, Jacob was Joseph’s biological father and Heli his legal father.
This shows that Christians were confronting the difference by at least the third century. It also shows how much information must be supplied from outside the Gospels. Neither Matthew nor Luke mentions a levirate marriage in Joseph’s immediate family. The explanation has to reconstruct marriages across the Solomon and Nathan lines, and it must address another disagreement over the father of Salathiel, or Shealtiel. Abel notes these and other difficulties with the hypothesis.
Genealogies can be arguments
Modern readers often approach a genealogy as if it were a civil registry. Ancient genealogies could also organize identity, inheritance, status, and theological meaning. Selectivity did not make them pointless. It made the author’s choices important.
Matthew’s announced pattern of fourteen makes the shaping visible. His royal line is compressed to fit the scheme. His list also names Tamar, Rahab, Ruth, and the wife of Uriah before Mary, unusual inclusions that connect the Messiah’s family to complicated biblical stories. Luke does not use Matthew’s royal sequence or numerical pattern. Instead, its long backward movement links Jesus to Adam and closes with “the son of God” (Luke 3:38 KJV).
Amy-Jill Levine’s comparison of the two infancy traditions treats both genealogies as ways of placing Jesus within Israel’s scriptures while noting the concrete disagreements: Solomon versus Nathan and Jacob versus Heli. Their shared theological destination does not turn the routes into the same historical list.
What can be concluded?
The text supports a modest conclusion. Matthew and Luke independently use genealogy to present Jesus as Davidic, but they construct that claim differently. Matthew builds a patterned royal history from Abraham to Jesus. Luke moves from Jesus through a nonroyal Davidic branch to Adam and God.
A legal-versus-biological genealogy is possible. A Joseph-versus-Mary genealogy is also logically possible. Both require details the Gospels do not provide, so neither can be established from Matthew and Luke alone. Calling the lists complementary is therefore an interpretation, not a simple reading of the names.
That does not make the genealogies empty. They tell us how each author wanted readers to understand Jesus. It does mean that a claim of perfect historical agreement carries a burden beyond showing that reconciliation can be imagined. The question is not whether a harmonization is possible, but whether the available evidence gives us a good reason to think it happened.