Born in Inicbulan, Bauan, Batangas to parents Nicanor Castillo Marasigan and Petra Gonda Evangelista, Eliodoro married Rosario Esteban Marquez of Tondo, Manila and together they had ten children.
1933: Finished high school at Batangas High School
1935: Entered pre-law at the College of Liberal Arts, University of the Philippines and finished his law courses at the College of Law, University of the Philippines
1940: Passed the Bar Examination in 1940 with a grade of 81.6%
1940 – 1942: Private law practice
1942 – 1945: Guerilla Major, Blue Eagle Command (Underground guerilla leader against the Japanese during World War II)
March 1945 – June 1945: Member of 11th Airborne Division, US Army during liberation of the Philippines
June 1945 – November 1947: Chief Investigator, Base ‘R’, U.S. Army
1947: At this time, he earned the respect and support of the barrios of Inicbulan, Rizal and Durungao – that whoever he supported politically carried a big edge.
His friend Feliciano Leviste was running for governor of Batangas and was challenged by an influential person Modesto Castillo, who was close to the Mayor of Bauan and Manuel Roxas, the President of the country. He was lured by the mayor to come to Manila to meet with secretary of Justice Ramon Ozaeta who told him that President Roxas would name him as Assistant Fiscal of Manila if he would support Castillo instead of Leviste. With due respect, he declined the offer because he already promised Leviste his support and to break his word was never an option to him.
With his help, Leviste won the election.
1948: Governor Leviste made him Batangas Provincial Board Secretary.
That same year he was offered, by his friend and then congressman, Pedro Munoz, whom he supported in previous election, to become the Fiscal of Batangas – a very prestigious government position – with one caveat; that to accept this position he had to sacrifice the P10,000 pork barrel appropriation for the Inicbulan school which will then be given to another barrio.
He declined the position and opted for the P10,000 for the school. The money was used to build two classrooms. He did not stop there. He approached other politicians for funding to continue expanding the school and was able to get grants from President Garcia, Congressman Babao, Senator Jose P. Laurel, Claro Recto and Vice-President Fernando Lopez.
The construction was supervised by his father Nicanor which added the H. E. and the shop buildings. Then he approached Speaker Jose B. Laurel, Jr. for more money to build the first high school building. He got that, also.
In 1957, when the construction was finished, President Garcia granted him the greatest honor of accepting to come to Inicbulan to inaugurate the school building. It was the most glorious event that ever happened to the school.
1949 – 1954: Re-entered private law practice but continued to be politically active.
In 1950, he and his father, Nicanor, successfully convinced governor Leviste to provide funds to build a potable water system by gravity from the mountain of Katmon in Guintuan, a few miles above Inicbulan. The project was completed and the water started to flow in adjacent barrios but the source did not have enough volume to reach the neighboring barrios of Rizal and Inicbulan.
The father and son did not give up in getting water to Inicbulan and lobbied other politicians, including then President Ramon Magsaysay, to fund many artesian wells in both Inicbulan and Rizal.
In 1952, he successfully acquired funds from then Speaker Eugenio Perez to build a large artesian well near the school. This well was a pet project of his father Nicanor.
In 1979, his brother, Nemesio, applied his expertise in engineering and designed the first successful waterworks system in all of Bauan, by providing a huge pump, a storage tank at the highest peak in the barrio and a piping system with water meters. It now provides flowing water to every house in Inicbulan at the most affordable rate.
1954 – 1955: Manager, NASSCO (Appointed by President Magsaysay to the National Shipyard Corporation)
1956 – 1957: Examiner, Court of Agrarian Relations
1958 – 1968: Assistant City Fiscal, Manila (Appointed by President Garcia)
In 1960, he and a group of prominent leaders in Rizal and Inicbulan formed an association called ‘Samahang Inibulan Rizal –S.I.R.’ whose main goal was to improve the lives of the peoples of the two barrios.
In 1964, he showed courage in face of threats of his life by refusing security from the Manila Police department and continued his pursuit of justice against the most feared people in the government.
In 1966, he was named ‘The Honest Public Servant of the Year’ by the Philippine Institute of Leadership.
1968 – 1973: Judge, Court of First Instance.
He was nominated by Jose B Laurel, Jr. and was approved by his classmate and friend President Ferdinand Marcos. Marcos was his classmate in U.P. and they sat next to each other in classes – they being arranged alphabetically.
He was visiting his children in the USA when Marcos declared martial law. He did not advocate what Marcos did so he resigned from office while in the states.
1973 – 1975: Columnist, Pilipino Reporter. He donated all his earnings to the teachers of Inicbulan High School who, at the time, were not being paid fairly by the government.
1975: Retired from work and relaxed by traveling with his wife and younger children in Europe and the Middle East. He also indulged himself with home gardening and caring for grandchildren.