Who was Emperor Constantine's wife, and did he change the Sabbath to Sunday?

Emperor Constantine's wife was Fausta, but neither she nor Constantine himself had the authority to change God's Sabbath. Historically, Constantine supported the civil elevation of Sunday, yet from a biblical standpoint, the seventh day, sanctified by God, remained unchanged.

The question of Constantine’s wife often arises alongside the claim that the emperor himself "transferred" the sanctity of the Sabbath to Sunday. Historically, this is inaccurate. Constantine the Great was married to Fausta, the daughter of Emperor Maximian. Prior to that, he had a relationship with Minervina, who bore his son Crispus. But when it comes to the Sabbath and Sunday, the decisive factor is not the emperor's family life, but the question: Can human authority alter the Law of God?

God instituted the Sabbath at Creation

The Bible shows that the Sabbath did not originate from Rome, emperors, or church councils. It was established by God Himself at the very beginning of human history.

“By the seventh day God had finished the work he had been doing; so on the seventh day he rested from all his work. Then God blessed the seventh day and made it holy, because on it he rested from all the work of creating that he had done.” Gen 2:2–3

Later, this same truth was included in the Ten Commandments. The Sabbath commandment is not a human ordinance, but part of God's moral Law.

“Remember the Sabbath day by keeping it holy. Six days you shall labor and do all your work, but the seventh day is a sabbath to the Lord your God.” Exod 20:8–10

From a Seventh-day Adventist perspective, this means that no emperor, bishop, or ecclesiastical tradition can abolish or rewrite what God has sanctified.

What Constantine actually did

In 321 AD, Constantine issued a civil decree mandating rest on the "venerable day of the Sun." This law primarily concerned civic and urban life. It was not a new biblical commandment, nor did it alter the text of Holy Scripture. It was a state measure that supported an already existing trend of Sunday observance in parts of the Christian world.

In other words, Constantine did not "change the Sabbath to Sunday" in the sense of altering God's ordinance. He merely helped solidify the practice of Sunday rest within the empire. The shift from the biblical Sabbath to Sunday occurred gradually: through detachment from Jewish roots, a desire to differentiate from Judaism, the growing ecclesiastical tradition of the first day of the week, and the backing of civil power.

For Adventist understanding, this distinction is vital: history explains how Sunday gained prominence, but it cannot grant it the biblical authority that belongs solely to God’s Word.

Jesus and the apostles observed the Sabbath

If we seek a model for the Christian life, it is found in Christ and the apostolic church. The Gospels show that Jesus observed the Sabbath.

“He went to Nazareth, where he had been brought up, and on the Sabbath day he went into the synagogue, as was his custom. He stood up to read.” Luke 4:16

After Christ's resurrection, the apostles continued ministering on the Sabbath day. Paul did not treat the Sabbath as an abolished institution.

“As was his custom, Paul went into the synagogue, and on three Sabbath days he reasoned with them from the Scriptures.” Acts 17:2

Another significant passage highlights the unchangeable nature of Christ, and consequently, the trustworthiness of His Word.

“Jesus Christ is the same yesterday and today and forever.” Heb 13:8

Therefore, from a biblical perspective, the question is not what an emperor decreed, but what the Lord teaches.

Human tradition and God’s commandment

In the New Testament, Christ warned against substituting human traditions for God's commandments. This principle is crucial when considering the Sabbath and Sunday.

“You have let go of the commands of God and are holding on to human traditions.” Mark 7:8

This is precisely why Seventh-day Adventists believe that Christians must test every tradition against Scripture. If a particular custom emerged later and lacks direct biblical foundation, it cannot take the place of God’s commandment.

Ellen G. White repeatedly wrote that in the end times, the issue of faithfulness to God’s Law would become especially vital. Her writings emphasize that genuine reform always leads people back to the Bible, rather than to human authorities. For Adventists, this is not merely a historical dispute, but a matter of loyalty to the Creator.

Who Fausta was and why it is secondary

Historically speaking, Constantine’s wife was indeed Fausta. However, there is no evidence that she was behind any theological "change of the day of worship." Even had she possessed political influence at court, it would not alter the core of the issue. The sanctity of the Sabbath does not derive from the Roman imperial court or ecclesiastical politics, but from God.

Thus, the key takeaway is this: Fausta was the emperor's wife, but she does not define Christian doctrine. Faith is built not upon the names of earthly rulers, but upon the Word of God.

Conclusion

In short, Emperor Constantine's wife was Fausta. However, the claim that Constantine "changed the Sabbath to Sunday" is an oversimplification. He could influence civil legislation and societal customs, but he could not change God’s commandment. The Bible teaches that the Sabbath is the seventh day, blessed and sanctified by God.

The practical takeaway for us is simple: do not base your convictions solely on church history or human authorities, but personally study the Scriptures, pray, and faithfully follow what the Lord has revealed. If you desire to live according to God's will, take a simple first step: re-read the passages regarding the Sabbath in Genesis 2, Exodus 20, and the Gospels, and ask yourself which day God truly sanctified.