The Ministry of Justice (MJUS) was the department of the Government of Spain responsible for preparing and carrying out the government policy in order to bring the legal system off, specially in criminal, civil, commercial and procedural law affairs, supporting the Administration of Justice and the legal and international cooperation.

[2] Likewise, it was responsible for processing the documents relative to grace right, titles of nobility and Grandees which resolution is given by the King and is carried out by the Council of Ministers, giving legal attendance to the State administrations and it is the communication channel of the Government with the Administration of Justice, with the General Council of the Judiciary and with the Prosecution Ministry, through the Attorney General, as well as with the governing bodies of the autonomous communities with judicial responsibilities, the Spanish Data Protection Agency and the associations of legal experts.

[4][5][6] However, the true germ of the ministry is found in the Royal Decree of 30 November 1714, which, similar to the French model, divided matters by subject, creating four Secretariats of the Dispatch, among which was the Secretariat of State and of the Dispatch of Ecclesiastical Affairs, Justice and Jurisdiction, in charge of religious affairs, maintenance of royalties from the Crown, the regime of universities, and justice and jurisdiction of Councils and courts, especially in appointments.

However, this situation will last a short time because in December 1720 the Treasury business regained autonomy, splitting from the Ministry of Justice.

The subsequent reform of the year 1787 gives rise to a greater division of the Secretariats, as a solution to the accumulation of affairs and businesses from the Indies.

Thus, it was attributed to this Secretariat everything to the appointments of archbishops, bishops, ecclesiastical dignities, perks, trades and chaplaincies; the government of courts and chancery, the appointment of its presidents, governors and ministers, and the resources of justice; the provision of the corregimientos not destined to war and property; the conservation of royalties of the Crown, as well as the dispatch of what is convenient to the royal houses and the provision of their jobs and the care of the observance of laws and pragmatics.

Likewise, the First Notary of the Kingdom also intervened in the civil acts of the Spanish royal family, raising the records of the births, marriages and deaths of their individuals, and authorizing their marital capitulations, powers, assignments and other provisions and contracts.