In the time of Justinian a will founded partly on the "jus civile", partly on the edict of the "praetor", partly on imperial constitutions and so called "testamentum tripertitum", was generally in use. The main points essential to its validity were that the testator should possess testamentary capacity, and that the will should be signed or acknowledged by the testator in the presence of seven witnesses, or published orally in open court. The witnesses must be "idonei", or free from legal disability. For instance, women and slaves were not good witnesses.