Penglaz is the historical name traditionally associated with mast or pole style ‘Obby ‘Osses in the Penwith region of Cornwall. They are first described in the 19th century following mummers, dancers and guizers during the Christmas/Midwinter festive period. Modern Penglaz ‘Osses were revived in 1992. They were first introduced by Cornish piper Merv Davey and appeared at Penzance’s newly revived Midsummer Golowan festival. The original Penglaz was later renamed and instead now accompanies the traditional Cornish music group Pyba in their guizing performances.

The Penglaz Teazer role, introduced as an official role by Golowan festival the 90's, may in fact be a traditional one as the ‘Oss is recorded as having been lead by a ‘master’, there is even confusion amongst antiquarians whether it was this ‘master’ or the ‘Oss who originally bore the name Penglaz.

The tradition of Penglaz making an outing during the Midwinter period was revived in 2007 with modern Penglaz 'Osses and their Teazers appearing at Penzance's Midwinter Montol festival, with ferstival goers dressed in guize and mock-formal attire. Very sadly, Penglaz 'Osses made their last appearances at the Montol festival in 2009. The only 'official' appearance we are left with is a far less traditional one, in which a Penglaz 'Oss dances about, rather incongruously, infront of a marching band with someone who appears to be dressed in a fairy costume complete with blue lights, at the recently deteriorating and increasingly commercial Golowan Festival.

Encouragingly, there are other examples of Penglaz ‘Osses extant within Penwith today, and traditional Midwinter appearances are likely to continue in a smaller way outside of the official festivals, much like we see with the Mary Lwyd traditions in Wales.