Robb de Peyster Tytus

In the early 20th century, Egyptologist and politician Robb de Peyster Tytus assembled the estate from the merger of three farms in Tyringham and additional land in Otis. The land holdings of the estate with the three farms grew to almost 1,000 acres (4 km²).

On a hill overlooking the southern end of Tyringham Valley, Tytus built between 1910 - 1912 a white, Georgian-style mansion which came to be known as the Marble Palace. The mansion's main façade featured four Doric columns and was spanned by thirteen bay windows. Its interior contained thirty-five rooms, ten baths, and fifteen fireplaces. Though the Marble Palace was destroyed by fire in 1952, the front terrace, foundation, and four Doric columns remain today.^[1]

In 1913, Tytus died at Saranac Lake, New York, leaving his wife, Grace Henoys Tytus, and two daughters, Mildred and Victoria.

John Stewart McLennan Jr.

A year after Tytus' death, his widow married John Stewart McLennan, a Canadian industrialist and newspaper owner, and later Senator. She gave birth, in 1915, to John Jr., before subsequently being divorced.

John S. McLennan Jr. spent all his childhood summers at the Tytus estate, and acquired the property in 1937, following the death of his mother. He later moved into the farmhouse at the bottom of the hill, and renovated the nearby barn into a music studio. McLennan was an accomplished composer of contemporary classical music, including chamber and orchestral music and pieces for piano and organ. (In 1985 he won an American Academy of Arts and Letters music award.) He designed the elegant gardens as a parallel creative effort to his musical work,.^[2] In 1977 John began donating sections of the Ashintully estate to The Trustees of Reservations, although, he continued to live at the estate for the rest of his life.

Shortly before his death, in 1996, John and his wife Katharine donated additional land to the Trustees. The land, including the Marble Palace ruins, the farmhouse, and Ashintully Gardens, was donated with a reserved life estate for Katharine McLennan. Initially, 18 acres (73,000 m²) were reserved for Katharine; she donated 12 acres (49,000 m²) to the Trustees in 2003, retaining 6 acres (24,000 m²) with garden access, upon which her cottage resides.

After her death in 2017, the title for the remaining land was turned over to the Trustees.

The Gardens and John McLennan's life were profiled in a 2007 episode of the GardenStory series,^[2] presented by Community Idea Stations of Virginia, and broadcast nationally on American Public Television.^[3]