chief justice is considered a de facto tenure; legally void since the ouster of her predecessor. Sereno filed an ad cautelam motion for reconsideration pleading for the reversal of the decision on May 31, 2018, but on June 19, 2018 was denied with finality (meaning no further pleading shall be entertained, as well as for the immediate entry for judgment) for lack of merit. As a result of Republic v. Sereno, Maria Lourdes Sereno is no longer considered the 24th chief justice of the Philippines, as the court ruled that her appointment was never legal but null and void ab initio. Thus, on August 25, 2018, Teresita de Castro was appointed by President Rodrigo Duterte as the new de jure and 24th chief justice of the Supreme Court of the Philippines. Acting Chief Justices The following became Senior Associate Justices in their tenure in the Supreme Court: Demographics Longevity By age group By gender By appointing president By law school Notable chief justices José Yulo is the only former speaker of the House of Representatives to be subsequently appointed as chief justice. Another, Querube Makalintal, would be elected as Speaker of the Interim Batasang Pambansa (parliament) after his retirement from the court. On the other hand, Marcelo Fernan would, after his resignation from the court, be elected to the Senate and later serve as president of the Senate. Other chief justices served in prominent positions in public service after their retirement include Manuel Moran (ambassador to Spain and the Vatican), and Hilario Davide, Jr. (ambassador to the United Nations). In addition, César Bengzon was elected as the first Filipino to sit as a judge on the International Court of Justice shortly after his retirement in 1966. Roberto Concepcion was reputedly so disappointed with the court's ruling in Javellana v. Executive Secretary where the majority affirmed the validity of the 1973 Constitution despite recognizing the flaws in its ratification, that he retired two months prior to his reaching the mandatory retirement age of 70. Thirteen years later, after the ouster of Marcos, the 83-year-old Concepcion was appointed a member of the 1986 Constitutional Commission tasked with drafting a new constitution. Drawing from his experiences as chief justice in the early days of martial law, Concepcion introduced several new innovations designed to assure the independence of the Supreme Court, such as the Judicial and Bar Council and the express conferment on the