Question: What year was the university established whose honor society is The Senior Skull Society?

Context paragraphs:
Phi Kappa Phi: The Honor Society of Phi Kappa Phi (or simply Phi Kappa Phi or ΦΚΦ ) is an honor society established in 1897 to recognize and encourage superior scholarship without restriction as to area of study and to promote the "unity and democracy of education".  It is the third academic society in the United States to be organized around recognizing academic excellence, and is the oldest all-discipline honor society.  The society's motto is Φιλοσοφία Kρατείτω Φωτῶν ("Philosophía Krateítõ Phõtôn"), which is translated as "Let the love of learning rule humanity", and its mission is "to recognize and promote academic excellence in all fields of higher education and to engage the community of scholars in service to others."

University of Maine: The University of Maine (also referred to as UMaine, Maine or UMO) is a public research university in Orono, Maine, United States.  The university was established in 1865 as a land grant college and is the flagship university of the University of Maine System.  The University of Maine is one of only nine land, sea and space grant institutions in the nation.

The Senior Skull Honor Society: The Senior Skull Society is a collegiate honor society at the University of Maine, founded on December 14, 1906 by 11 men of various fraternities.  The purpose was "to recognize dedicated service to the University of Maine, to promote campus spirit, to keep an eye on the fraternities, and to discipline freshmen".  In 1913, the president of the organization created a viable interfraternity council, and the society has existed without interruption since World War II when it ceased to exist for only 3 years.  The society promotes the values of friendship, obligation, academics, dignity, and the standards and traditions of the University of Maine.

D.V.S. Senior Honor Society: The D.V.S. Senior Honor Society is an honor society at Emory University in Atlanta.  Founded in 1902, D.V.S. admits seven seniors each year based on their campus leadership, dedication to Emory, and academic excellence.  It is the oldest of Emory's five secret societies.  The other societies are the Paladin Society, Ducemus, Speculum, and The Order of Ammon.

The Order of Ammon: The Order of Ammon is a secret society of seven Emory University seniors who are chosen due to their merit, character, imagination, and persistent commitment to better Emory University and the world at-large.  Members are typically heavily involved with many organizations on Emory’s campus and have excelled in academics, athletics, leadership, and service.  The Order of Ammon is one of several secret societies at Emory University, others of which include Paladin Society, D.V.S. Senior Honor Society, and Ducemus.  The members of The Order of Ammon are "never" revealed, unlike the Paladin Society and D.V.S. Senior Honor Society, which reveal their members during graduation.

National Honor Society: The National Honor Society (NHS) is a nationwide organization for high school students in the United States and outlying territories, which consists of many chapters in high schools. Selection is based on four criteria: scholarship (academic achievement), leadership, service, and character.  The National Honor Society requires some sort of service to the community, school, or other organizations.  The time spent working on these projects contributes towards the monthly service hour requirement.  The National Honor Society was founded in 1921 by the National Association of Secondary School Principals.  The Alpha chapter of NHS was founded at Fifth Avenue High School by Principal Edward S. Rynearson in Pittsburgh, Pennsylvania.

Pi Sigma Alpha: Pi Sigma Alpha (ΠΣΑ or PSA), the National Political Science Honor Society, is the only honor society for college and university students of political science in the United States.  Its purpose is to recognize and promote high academic achievement in the field of political science.  It is a member of the Association of College Honor Societies (ACHS) and adheres to all the standards set by ACHS for an upper-division, specialized honor society.  Pi Sigma Alpha is not a social fraternity or club.

Scott J. Silverman: Scott J. Silverman was born in Silver Spring, Maryland, United States, on June 25, 1957.  At the age 13, he moved with his family to Miami Beach.  Growing up in Bay Harbor Islands, he attended Nautilus Junior High School and Miami Beach Senior High.  He graduated magna cum laude (high honors) from the University of Miami in 1978 with a BBA in finance.  A recipient of the Flammang Academic Scholarship, while attending college Silverman was recognized on the President's Honor Role three times and on the Dean's list every semester.  His academic honors include membership in Phi Kappa Phi (Honor Society in all fields), Beta Gamma Sigma (Business Honor Society), Omicron Delta Epsilon (International Economic Honor Society), and Alpha Lambda Delta (Freshman Honor Society).

Aurelian Honor Society: Established in 1910, the Aurelian Honor Society is the fifth oldest landed secret society at Yale University in New Haven, Connecticut.  It is a member of the Ancient Eight, which also includes Skull and Bones, Scroll and Key, and other "Sheff Societies" such as Book and Snake, Berzelius and Mace and Chain.  Most societies refer to their spaces as 'tombs' but Aurelian's is officially known as "The Rooms", quarters in SSS constructed specifically for the use of the Aurelian Honor Society.  Yale banned Aurelian from the Rooms in 2016 due to inappropriate conduct.  In 2017, Aurelian moved their belongings from SSS 405 to new rooms in the Quinnipiack Club.

Phi Delta Phi: Phi Delta Phi (ΦΔΦ) is an international legal honor society and the oldest legal organization in continuous existence in the United States.  Predating even the American Bar Association, Phi Delta Phi was originally a fraternity; however, it became an honor society in 2012.  Until its switch to becoming an honor society in 2012, Phi Delta Phi was the oldest professional fraternity in continuous existence.  The fraternity was founded at the University of Michigan in 1869 "to promote a higher standard of professional ethics."

Supporting paragraphs: The Senior Skull Honor Society University of Maine
Answer: 1865