Question: When was the Native American leader, teacher, lecturer, activist and author born with whom Clyde Howard Bellecourt co-founded AIM in 1968?

Context paragraphs:
Dennis Banks: Dennis Banks (born April 12, 1937), a Native American leader, teacher, lecturer, activist and author, is an Anishinaabe born on Leech Lake Indian Reservation in northern Minnesota.  Banks is also known as Nowa Cumig ("Naawakamig" in the Double Vowel System).  His name in the Ojibwe language means "In the Center of the Universe."  He has been a longtime leader of the American Indian Movement, which he co-founded in 1968 with Native Americans in Minneapolis.

Hiawatha: Hiawatha (also known as Ayenwatha, Aiionwatha, or "Haiëñ'wa'tha" in Onondaga) was a pre-colonial Native American leader and co-founder of the Iroquois Confederacy.  Depending on the version of the narrative, he was a leader of the Onondaga, or the Mohawk, or both.  According to some versions, he was born an Onondaga, but adopted into the Mohawk.

Tanacharison: Tanacharison or Tanaghrisson (c. 1700 – 4 October 1754) was a Native American leader who played a pivotal role in the beginning of the French and Indian War.  He was known to European-Americans as the Half King, a title also used to describe several other historically important Native American leaders.  His name has been spelled in a variety of ways.

Clyde Bellecourt: Clyde Howard Bellecourt (born May 8, 1936) is a White Earth Ojibwe civil rights organizer noted for co-founding the American Indian Movement (AIM) in 1968 with Dennis Banks, Herb Powless, and Eddie Benton Banai, among others.  His older brother, the late Vernon Bellecourt, was also active.  Clyde was the seventh of 12 children born to his parents (Charles and Angeline) on the White Earth Indian Reservation in northern Minnesota.

Sem-Yeto: Sem-Yeto, christened Francisco Solano and also known as Chief Solano (  1798 – c. 1851 ), was a famous leader of the Suisunes, a Patwin people of the Suisun Bay region of California.  Chief Solano was a notable Native American leader in Alta California because of his alliance, friendship, and eventually the support of his entire tribe to General Mariano Guadalupe Vallejo of Sonoma, in military and political excursions around Sonoma County and the San Francisco Bay Area.

Eneboerne: Eneboerne (The Hermits) is one of the early short stories by the Danish author Karen Blixen.  It was published in the journal "Tilskueren" in August 1907 under the pen name Osceola, a famous early 19th-century Native American leader.  It tells the story of Lucie and Eugène, a young couple who go to a deserted island where Eugène can better apply himself to writing a book.  Increasingly isolated, Lucie is drawn into a world of dreams and the forces of nature.  The ghost of a deceased army officer convinces her that her place is not on the island.  Ultimately, overcome by the eternal forces of the sea, the sky and the earth, she is tempted into the ocean where she drowns.

Vernon Bellecourt: Vernon Bellecourt (WaBun-Inini) (October 17, 1931–October 13, 2007) was a member of the White Earth Band of Ojibwe (located in Minnesota), a Native American rights activist, and a leader in the American Indian Movement (AIM).  In the Ojibwe language, his name meant "Man of Dawn."

Tecopa (Paiute leader): Tecopa (c.1815–1904) was a Native American leader, his name means wildcat.  Tecopa was a leader of the Southern Nevada tribe of the Paiute in the Ash Meadows and Pahrump areas.  In the 1840s Tecopa and his warriors engaged the expedition of Kit Carson and John C. Fremont in a three-day battle at Resting Springs.  Later on in life Tecopa tried to maintain peaceful relations with the white settlers to the region and was known as a peacemaker.  Tecopa usually wore a bright red band suit with gold braid and a silk top hat.  Whenever these clothes wore out they were replaced by the local white miners out of gratitude for Tecopa's help in maintaining peaceful relations with the Paiute. <br>Tecopa is buried with his son and grandson at the Chief Tecopa Cemetery in the Pahrump Valley, Nevada.

Tiloukaikt: Tiloukaikt (also Tilokaikt or Teelonkike) ( unknown - 1850) was a Native American leader of the Cayuse tribe in the northwestern United States.  He was involved in the Whitman Massacre and was a primary leader during the subsequent Cayuse War.

Brian Cladoosby: Brian Cladoosby is a Native American leader and activist.  He has served as chairman of the Swinomish Indian Tribal Community since 1997 and was elected president of the National Congress of American Indians in October 2013.  Cladoosby is active in defending tribal sovereignty, especially regarding salmon fishing and water rights.  Cladoosby has been a staunch opponent of the Dakota Access Pipeline.

Supporting paragraphs: Clyde Bellecourt Dennis Banks
Answer: April 12, 1937