Roedd awel arogli coffi yn llenwi'r rostir yng Nghaerdydd.

A breeze smelling of coffee filled the rostir in Caerdydd.

Roedd yn amser prysur, fel bob amser, gyda'r ystaff ymlaen ag addurno'r safle ar gyfer Calan Gaeaf.

It was a busy time, as always, with the staff forward in decorating the site for Calan Gaeaf.

Emrys ac Carys, brawd a chwaer, oedd wedi gweithio yno dros y blynyddoedd ers diwedd eu tad.

Emrys and Carys, brother and sister, had worked there over the years since the end of their father.

Ond heddiw, roedd rhywbeth anarferol wedi digwydd.

But today, something unusual had happened.

Yn y bore, wrth i Emrys glirio blwch llyfrau hen a erledig o'r oriel ieuengaf, cafodd lythyrau wedi’u lapio mewn rhuban o liw gwin cyfoethog.

In the morning, as Emrys cleared a box of old and hunted books from the youngest gallery, he found letters wrapped in a ribbon of rich wine color.

"Carys, edrych ar hwn!" ebe Emrys, ei lais yn ysgytiog rhwng sioc a chwilfrydedd.

"Carys, look at this!" said Emrys, his voice shaky between shock and curiosity.

Daeth Carys ymlaen, ei llygaid yn ymestyn.

Carys came forward, her eyes widening.

"Llythyrau? O ble?" Ei dannedd yn fflachio mewn gwên frwdfrydig.

"Letters? From where?" Her teeth flashed in an enthusiastic grin.

"Mae'n siŵr bod marciau arnynt... Mmm, edrych!"

"There must be marks on them... Mmm, look!"

Roedd y llythyrau wedi'u hysgrifennu mewn llaw ysgrifen dirgel, yn trafod dirwriaethau teuluol ac anturiaethau a oedd yn ymddangos yn anghyfarwydd iddynt.

The letters were written in a mysterious handwriting, discussing family intricacies and adventures that seemed unfamiliar to them.

Emrys, priod â rhesymeg crafog, ysgwyd ei ben.

Emrys, married to razor-sharp logic, shook his head.

"Mae'n rhaid bod hen straeon ydy'r rhain."

"These must be old stories."

Ond roedd Carys, nug enaid wiwer, yn fentro i'r dirgelion hynny, ymestyn llaw i annog ei brawd.

But Carys, a squirrel's soul, ventured into those mysteries, reaching out to urge her brother.

"Emrys, dyma ein cyfle! Bydd hyn yn datgloi ein gorffennol."

"Emrys, this is our chance! This will unlock our past."

Roedd Emrys yn amheus.

Emrys was skeptical.

"Beth os yw hyn yn cyflwyno trafferthion newydd? Mae ein bywydau'n iawn fel ag y maen nhw."

"What if this brings new troubles? Our lives are okay as they are."

Daeth yr otsiad dyddiau lawer o siwrne heb fentro cesail Emrys ymlaen, ond diddordeb a dyfalbarhad Carys yn ennill.

The urging of many days of untouched journeys did not venture beyond Emrys's protective arm, but Carys's interest and perseverance won out.

Fe wnaethant ddechrau tynnu rhanau o leinau dirgel a allai arwain at leoliad hudol.

They began to draw parts of mysterious threads that could lead to an enchanting location.

"Llythrennol dyn ni dal yn atgofion plentyndod," meddai Emrys, yn plygeinio i'r antur sydd leiafrifol.

"Literal leftovers of our childhood," said Emrys, reluctant to delve into the adventurous minority.

Un prynhawn, wrth iddi wawrio dros Gaeaf, fe ddechreuon nhw fynd i fan oedd yn gysylltiedig â’u hatgofion plentyndod.

One afternoon, as it dawned over Winter, they began to go to a place linked to their childhood memories.

Lle maes chwarae unig a hen adeilad i blant oedd yno.

A solitary playground and an old building for children were there.

Ond yn ei hanes cudd, roedd cyfrinach.

But in its hidden history, there was a secret.

Roeddent yn disgwyl, amneidio calonog, a gweld a oedd gadael neu fynd heibio i'r dim.

They waited, nodding heartened, to see whether they would leave or pass by the nothingness.

Fe gurodd eu calonnau'n gyflym.

Their hearts beat quickly.

Yr hyn gawsant oedd trysor heb ei gydnabod.

What they found was an unrecognized treasure.

Absenoldeb athrylith neu dealltwriaeth o bwrpas gwych, ond deallasant y cysylltiad oedd wedi creu â'u tad nawr wedi esgus y cyffiniau llechu.

The absence of genius or understanding for a great purpose, but they understood the connection that had been created with their father now, disguising the lurking outskirts.

Fel Emrys a Carys yn sefyll y tu hwnt i'r waliau distaw, roeddent yn darganfod dealltwriaeth newydd o'u teulu, tawelwch newydd o undod.

As Emrys and Carys stood beyond the silent walls, they discovered a new understanding of their family, a new peace of unity.

Pan cerddwyd o'r safle, Emrys am y tro cyntaf yn sylweddoli mawreddi'r anhysbys.

When they walked away from the site, Emrys for the first time realized the majesty of the unknown.

A chyda chryfder newydd, eisteddodd ei sorod arno fo a dywedodd, "Rydw i'n falch ein bod yn mentro, Carys."

And with new strength, his sister sat beside him and said, "I'm glad we ventured, Carys."

Roedd y cyfan yn cynnig cudd-wybodaeth ar eu dynoliaeth, a dyna oedd dechrau'n wir o gyfrinachau eraill i ddod.

It all offered hidden wisdom on their humanity, and that was truly the beginning of other secrets to come.