Maybery was born in Newport in 1887. His father, Francis, was a bootmaker in Newport and his mother, Julia (nee Marshall), was Francis' second wife and 20 years younger than her husband. Maybery studied art from a young age and began exhibiting his work at sixteen.
He studied at the South Kensington School in London,
and by his mid thirties he was a member of the Royal Cambrian Society
and the Royal West of England Academy. During
the First World War he served in the Royal Welsh Fusiliers where
he spent much of his spare time sketching. He returned to Newport after completing his service. Maybery painted numerous views of South Wales and the West of England, primarily watercolours. He executed oil paintings and watercolours of other parts of the country as well.