Thyme (Thymus vulgaris) is a low-growing, evergreen sub-shrub native to the Mediterranean, with tiny, strongly aromatic leaves and small violet-pink flowers that draw large numbers of bees. A member of the mint family, it rarely grows more than a few centimetres tall. Its genus name likely derives from the Greek "thyein" — "to sacrifice" or "to burn as incense" — a reminder of how closely the plant has long been tied to burning as an offering. Its scientific species name "vulgaris" — "common" — reflects just how widespread and everyday the plant has long been across the Mediterranean, even though its scent and effects are anything but ordinary.

In ancient Egypt, thyme was used in embalming; in ancient Greece it was burned as incense in temples — the Greek word "thymos" is linked to courage and vital spirit, and Greek soldiers are said to have rubbed themselves with thyme oil before battle to gain bravery. In medieval Europe, sprigs of thyme were placed under pillows to ward off nightmares and grant courage, and in England, wild thyme was popularly believed to be a favoured dwelling place of fairies. For centuries it also remained a staple of folk medicine as an antiseptic remedy for respiratory complaints — an effect later traced to its constituent thymol, still found today in numerous mouthwashes and cough remedies. In the kitchen, thyme is a familiar component of "herbes de Provence," and Greek thyme honey, such as that from Mount Hymettus, has been prized as a delicacy since antiquity. The Romans are also said to have strewn thyme in beds to instill courage and dispel melancholy, and medieval knights sometimes carried a scarf embroidered with a sprig of thyme into battle as a token of bravery.

Burned as incense, thyme releases a warm, herbaceous, faintly medicinal-green scent with a peppery sharpness. It is associated with courage, cleansing, and protection, traditionally used to clear a space of illness and negative energy. Wild-growing thyme, often known by the name creeping thyme, is also found on dry meadows and rocky slopes far beyond the Mediterranean, and in many rural regions of Europe was traditionally bound together with other herbs into incense bundles. Burned as incense, it pairs particularly well with rosemary or bay laurel, with which it has traditionally been burned together in many Mediterranean purification rituals.