Natural obligation system existed in the late Roman Republic when the thought of Greek natural law came into Rome, especially when Greek Stoic philosophy was accepted.

• 早期的罗马法并无自然债务的概念,自然债务制度是在罗马共和国末期,希腊自然法思想传入罗马被逐渐接受并最终被认可的过程中产生的。