Rose window is often used as a generic term applied to a circular window, but is especially used for those found in Gothic cathedrals and churches. The windows are divided into segments by stone mullions and tracery. The term rose window was not used before the 17th century and comes from the English flower name rose. The name "wheel window" is often applied to a window divided by simple spokes radiating from a central boss or opening, while the term "rose window" is reserved for those windows, sometimes of a highly complex design, which can be seen to bear similarity to a multi-petalled rose. Rose windows are also called "Catherine windows" after Saint Catherine of Alexandria, who was sentenced to be executed on a spiked breaking wheel. A circular window without tracery such as are found in many Italian churches, is referred to as an ocular window or oculus. Rose windows are particularly characteristic of Gothic architecture and may be seen in all the major Gothic Cathedrals of Northern France. Their origins are much earlier and rose windows may be seen in various forms throughout the Medieval period. Their popularity was revived, with other medieval features, during the Gothic revival of the 19th century so that they are seen in Christian churches all over the world. Style Oculi: These could be open or blind, could be glazed or filled with thin alabaster. During the late Gothic period very large ocular windows were common in Italy, being used in preference to traceried windows and being filled with elaborate pictures in stained glass designed by the most accomplished Late Medieval and Early Renaissance designers including Duccio, Donatello, Uccello and Ghiberti. Wheel Windows: These windows had a simple tracery of spokes radiating either from a central boss or from a central roundel. Popular during the Romanesque period and Gothic Italy, they are found across Europe but particularly Germany and Italy. They also occur in Romanesque Revival buildings of the 19th and 20th centuries. Plate Tracery: Rose windows with pierced openings rather than tracery occur in the transition between Romanesque and Gothic, particularly in France and most notably at Chartres. The most notable example in England is the north transept window, known as the "Dean's Eye" in Lincoln Cathedral. These windows are occasionally found in 19th-century Revival buildings. Early Gothic: Rose windows with tracery comprising overlapping arcs like flower petals, circular and square shapes.