Curraghmore, County Mayo, showing very unusual rectangular fanlight detail.

https://tinyurl.com/yats5bhs

Errew Monastery (1840-2), County Mayo, showing unique point-arch and semicircle fanlight design.

https://tinyurl.com/ydfo6pzr

Ballyhowly House, County Mayo, drawn by Maurice Collis C.E. MRIA. Detail of undated engraving, reproduced courtesy of the National Library of Ireland (vtls000629592)

Ballinafad House (1827), County Mayo, showing internal view of elaborate spoked fanlight.

https://tinyurl.com/y9xex6r8

Mallow Cottage, originally Altamont Villa, County Mayo, showing elliptically arched fanlight with circle pattern.

https://tinyurl.com/yat8vht4

Newport House, Newport, County Mayo, showing rectangular fanlight with singular lens design.

https://tinyurl.com/ya7fl98q

Newport Glebe House (1819), County Mayo, showing cobweb fanlight with band of circlets.

https://tinyurl.com/ycpk7y8n

Swinford Glebe House (1819), Main Street, Swinford, County Mayo. Front elevation of Glebe House for the Revd Burrowes by John Lynn, Architect, Sligo, reproduced courtesy of the RCB Library (i_gh01700101)

Swinford Glebe House (1819), Main Street, Swinford, County Mayo, showing spoked fanlight.

https://tinyurl.com/ybnvvlqh

Belleek Manor (1825-31), Ballina, County Mayo, showing extravagantly ornate Tudor-Gothic fanlight and sidelights.

https://tinyurl.com/sajh9nk

Knockglass House, County Mayo, showing the ornate cobweb fanlight over the main door, replicated in the inner hall.

https://tinyurl.com/ychgblpq

Millbrook, County Mayo. Detail of undated engraving reproduced courtesy of the National Library of Ireland (vtls000240077)

https://tinyurl.com/ydyq8jne

Carrowmore House, County Mayo, showing highly unusual peacock fanlight pattern.

https://tinyurl.com/yct7j3xq

Ballinrobe Glebe House (1813), Main Street, Ballinrobe, County Mayo. Drawing of front elevation, reproduced courtesy of the RCB Library (i_gh01500201)

https://tinyurl.com/y9mhf6j8

Robe Villa, High Street, Ballinrobe, County Mayo, showing front elevation, 1980. Photograph by Hugh Doran, reproduced courtesy of the Irish Architectural Archive (046_100_X_002)

https://tinyurl.com/y9y86ece

Robe Villa, High Street, Ballinrobe, County Mayo, showing interior of doorway arch, 1980. Photograph by Hugh Doran, reproduced courtesy of the Irish Architectural Archive (046_100_Y)

https://tinyurl.com/y9y86ece

Burleigh House, Ellison Street, Castlebar, County Mayo, showing wide spoked fanlight.

https://tinyurl.com/yc68k3d2

Saint Gerald's Intermediate and Technical School (1908-9), Upper Chapel Street, Castlebar, County Mayo, showing cobweb fanlight.

https://tinyurl.com/ycsyenxq

Westport Glebe House (1815), Newport Road, Westport, County Mayo, showing petal fanlight and plain sidelights.

https://tinyurl.com/y7ze6hwa

Old Railway Hotel, North Mall, Westport, County Mayo, showing simple cobweb fanlight.

https://tinyurl.com/yc38zt9p

Westport Credit Union, originally Dower House, North Mall, Westport, County Mayo, showing elaborate cobweb fanlight and oval and lozenge sidelights. Photograph by Glasshaus Studio.

https://tinyurl.com/yb6dqvjm

Presbytery, South Mall and James' Street, Westport, County Mayo, showing unusual spoked fanlight with lenses and scrolls.

https://tinyurl.com/yc4ukg4a

The Octagon, Westport, County Mayo, showing cobweb fanlight with rectilinear hub stretching over sidelights.

https://tinyurl.com/y76939zc

J McGing, High Street, Westport, County Mayo, showing one of two identical geometric rectangular fanlights.

https://tinyurl.com/ydhlnb29

Rusheen Lodge, Westport, County Mayo.

https://tinyurl.com/y2on9yjq

Terrace of six houses on Pearse Street, Ballina, County Mayo, showing arcaded shopfronts with cobweb fanlights. Lawrence Collection photograph, reproduced courtesy of the National Library of Ireland (vtls000338742)

https://tinyurl.com/ya8djhys

The Fashion Shop, Pearse Street, Ballina, County Mayo, showing unusual crossed swords fanlight. Photograph by Glasshaus Studios.

https://tinyurl.com/y9nlpn7h

1 Abbey Street, Ballina, County Mayo, showing petal fanlight in rectilinear opening.

https://tinyurl.com/ycmaru6z